Hope this is a simple question?

It looks like some people are advocating for people to carry firearms into the.atres/cinemas to defend themselves, or if an event like this happens again, the number of casualties would be reduced?

Lets imagine there are, say, 10,000 theatres/cinemas x say 360 days per year x say 20 carrying a concealed firearm.

That come to 72,000,000 firearms concealed over 1 year.

WIll that really make theatres safer?