This can be true (and I think it is for certain individuals) and one can still be a proponent of the right to have a choice whether to be a passive victim or take responsibility for one's own physical security. Personally, I'd rather do the latter.

There's also a case to be made that mathematically, you're likely to have a short career as a mugger if one out of every, say, 5 individuals you target is likely to be armed. After all, why don't muggers target police officers?