Casinos don't want people to have guns (excluding their security staff). This means that even if you are citizen who has gotten better tactical training than most police and shoot more often than they do and have a CCW, they don't care.

Why?

The first reason is liability. If they ban all the guns, then in some sense I don't fully understand they are less liable should something happen. So so they think. I haven't been able to find any good case law or really anything that explains this. The closest I've come is that some insurance carriers get weak kneed over the idea and don't want guns carried around at the places they insure. 

Second the people in charge don't want you carrying. This could be normality bias from "your don't need a gun here" to outright hostility and leftist anti-gun thinking. Who knows. Some of it is rich people thinking "little people" who are dumb enough to lose money in the casino shouldn't have guns to begin with. 

Finally, and what I think the real answer is, some near-superstitious idea that if you ban guns, through security, signs, or magic detectors your gun problems will go away. In one sense, this is true. Credible security measures will scare off the criminal who doesn't want to get caught illegally packing. Some law-abiding citizens won't want to bother with the hassle of unassing their gun or being treated like a terrorist by security. 

As far as management, they banned the guns, so after that whatever happens is kinda like an act of god. Magical thinking I'm supposing here. They don't care what happens to you; your safety is not their priority. Their priority is making sure bad stuff doesn't happen on their property to create bad PR or shutdown gambling and loses them money. 

An idea solution would be, should an armed person come across the proverbial or actual radar, is to see if that person has a CCW. If they do, no harm no foul. Maybe ask them to disarm while drinking or on the casino floor. But no, that would be too hard for casinos to do. 

Let's be honest. The people causing problems with guns Downtown and on The Strip shouldn't have guns at all. They probably don't have CCWs and aren't openly carrying. They're drug addicts, drug dealers, felons, and gang members. No law will stop them from doing stupid, violent, and illegal stuff. 

Disarming customers and engaging in security theater doesn't make anyone safe. Private security measures don't extend to the street where customers frequently travel. So to answer the question: "Why do you need a gun in a casino?" the answer is that crimes do happen inside them, in their parking lots, and on the streets and areas immediately outside them. If I choose to patronize these businesses, I shouldn't be disarmed because of a poorly thought out kneejerk policy. 

And so what if the casino is now a sterile environment? Excluding the Mandalay Bay shooting, practically all the major gun battles on The Strip happened outside of casinos anyway. 

AB 133 on NELIS​

This bill is a direct response to the June 1, 2020, police killing of protestor Jorge Gomez, who was openly carrying during the riots in downtown Las Vegas in front of the federal courthouse. Police say Gomez was radicalized and may have tried to fire a shot. Police fired several less-lethal munitions at Gomez before shooting him. The exact details of the confrontation are disputed. The officers that night were not required to wear a body camera. 

The lead sponsor of the bill is Assemblyman Edgar Flores, not coincidentally the attorney for the family of the dead man. This June 12, 2020 article from the Nevada Current basically lays out why Flores is proposing what he's proposing. 

About the incident: Gomez did legally possess his weapons at the protest/riots, but what exactly he did is unclear. Nevada Carry is wary of long-gun open carry at rallies/protests and doubly so when things turn violent. Whatever Gomez may have done to get shot probably wasn't because he happened to be openly carrying. Whether police overreacted to an actual or perceived threat is up for discussion. 
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Bill analysis: On the surface, the bill would require police to active their body cams and be trained on interacting with persons who are openly carrying firearms. The language of the act leaves it suggests this would only apply in the case of actual enforcement or investigation, and not a casual or friendly encounter. 

 In the late 2000s, open carrier Tim Farrell was stopped by Metro without probable cause for openly carrying, which led to reforms and education within Southern Nevada law enforcement regarding open carry. Since then, police/open carrier interactions in Nevada have been overwhelmingly unremarkable. 

Bottom line: watch, but could be a good bill. It's a bit of an overreaction by someone who has a conflict of interest, but increasing police oversight around armed citizens exercising their rights can't be bad. What could be bad is the kind of anti-open carry amendments that might be tacked on. 

Nevada Firearms Coalition Announces Passing of NVFAC President Don Turner
Las Vegas – The Nevada Firearms Coalition is saddened to announce Monday the passing of is President, Don Turner, following his long battle with cancer.

Don Turner has been the heart and soul of the Nevada firearms community for many years, and his passing will be felt deeply by many across the state. Through his fierce and tireless dedication to the Second Amendment, Don was critical to restructuring and revitalizing the Nevada Firearms Coalition, and building the programming that was near and dear to his heart.

Under his leadership, the Nevada Firearms Coalition Foundation’s Annie Oakley Women’s Shooting Program has trained and empowered thousands of women to take ownership of their personal safety by increasing their skills and confidence with firearms. Don has also led the NVFAC PAC to include a full-time lobbying presence during the Nevada legislature to make sure the voices and rights of Nevada firearms owners continued to be protected.

Don’s legacy will continue to live on, not just in Las Vegas or Nevada, but across the country as he has dedicated his life to the ownership and safe use of firearms for self-defense, competition, recreation and hunting.

While we are now one fewer in our ranks, the Nevada Firearms Coalition will continue to protect and defend the Second Amendment and Nevada’s firearms owners, just as Don would want.

Our thoughts and prayers are with Don’s family, and we will share with you when we know more of their wishes for a celebration of Don’s life.