Its never stupid to be able to carry a weapon, however, when ever and where you want, assuming of course you are a sane law abiding citizen.
It absolutely is. Concerts, public gatherings, any situation in which one gunman sparking a free for all simply because nobody can tell which love muffin firing wildly is the real bad guy, and which ones are just law abiding citizens exercising their inalienable, American and utterly stupid right to carry a firearm on their person at all times.
Giving everybody a gun may be the best way to help those that would actually want to kill civilians; one shooter will start off a chain reaction, and result in exponentially greater casualties.
Don't get me wrong, I support the 2nd, but there's a point where it stops being reasonable, a point where it stops being smarter, and safe.