I genuinely think he's got that "someone told me I'm not allowed to do something so now it's my only thought and I will do it no matter what" mentality that 6 year Olds have.
Someone told him he's not allowed to use nuclear weapons, so he wants nothing more than to have an excuse.
"trying to grab to take a gun from a security guard"
Okay so obviously almost nowhere else is as insane as the US when it comes to firearms and therefore most people would have much better discipline when handling them and discharging or even pulling one, but the one thing I am sure of almsoy anywhere in the world is that you should NEVER try to grab someone else's gun from them unless you're prepared to get shot with it.
Dudes lucky he didn't do that in Texas or Florida.