"As long as they are obeying local and Federal weapons laws...." etc...

Then, in my honest opinion, there is a problem with those laws. Surely it is possible to have some sort of uniform national standard about such things.
I see that places like Arizona, New Mexico and Texas do not have exactly the same laws, but they DO have "reciprocal agreements" so that someone from Texas can behave in Texas as he would in Arizona...(I'd have to read a LOT more to see exactly how these are arranged.)
   In New Mexico, someone UNDER 21 can legally buy weapons from an unlicenced dealer. In Virginia, is it about the same, perhaps with a different age requirement. There is little dispute that it is easy for almost anyone to obtain 'almost' any firearm they wish...some legally, some illegally.
   Now, if someone buys a gun, even illegally, in one state...then goes to ---say Arizona where 'legal carry' is in effect, and straps it on, how long might it be before they are stopped & questioned? I see reports that the Secret Service was 'watching' these guys at the rally for Obama, but I don't see that each one was individually checked & vetted by authorities.
   This seems to me to be a situation that could easily lead to one where, after a few rounds (no pun intended) of everyone becoming used to seeing pistols and AR-15s at events, a group such as The Viper Militia could ................... (fill in all sorts of things.)
   You see, the laxness of the laws does MUCH more for those with nefarious goals than it does for law abiding citizens who do NOT take guns to political events.

In other realms, (such as operationg motor vehicles)there are all sorts of practices which are forbidden, even though 'some' folks could be trusted to do them safely. Attitudes toward guns are just so suffused with emotional layers that it is VERY difficult to get a totally rational analysis of the issues involved.

...and every day, the number of murders, accidents and threats FAR exceeds the events with positive outcomes like oldude relates.....why are we willing to tolerate so many?