I am claiming that common core creates idiots such as yourself who cannot comprehend anything other than black or white.
There would be safety concerns because the secret service has a duty to protect the candidates. Would you want to spend taxpayer money to vet each and every attendee?
There is a responsibility one undertakes when deciding to carry a firearm. The vast majority of firearm owners are responsible and take firearms very seriously. The person using the firearm is responsible for the bullet and where it ups end if it leaves the gun. I for one would not want to be in a situation with a crowd and having to take a shot. Should I miss and kill an innocent bystander, that would be on me. I will be charged and likely be destroyed financially. Guns are not magical life enders... it takes skill and practice to make the bullet go where you want it to go. There are different levels of skill and reactive behaviors based on what type of training can partake in. I have taken advanced classes taught by ex-special forces military trainers. I have also seen people shoot a handgun at a target 10 feet away and miss.
Now if I am in a convenience store and have a concealed weapon... my level of safety has increased. Around here at least I can safely say people who like to rob stores are going to pick on that is empty versus picking one that may have a customer or two loitering around.
If there could be assurances that all CCW's at the convention had advanced training and were vetted properly.... sure the convention hall would be a damn safe place. But it has also come apparent that leftists can easily become mentally unhinged and prone to violence. I would not put it past some of these groups, that if allowed into the convention with a handgun, they would shoot someone just to make a point. So in the sake of making the secret services lives easier... people can leave the gun locked and away from the convention.