No, let's assume that the average perpetrator commits four felonies before being charged or otherwise removed. That's still 100,000 active felons at any given instant.

Eyeballing that figure tells me that the true number for this sort of thing is actually higher still (US population 313 million). Although in the vast majority of cases, no formal charges will be made, and little will be done about those carrying these sorts of things out, and it is likely that those carrying these sorts of things out do this much more than four times

You're probably right, sadly. Maybe clubs serving alcohol should require some type of pat down/search for drugs as well as firearms. I don't have any good preventative answers for this one. Females have a very dangerous life to navigate; can never let their guard down.