Well, I have seen criminals in prison saying they were scared shitless of armed victims, and that they sought softer targets if they knew their victims could defend themselves. So shove your pro-criminal safety BS where the sun don't shine, because that's the only place it can survive.
Very eloquent.
Yes, robbers seek the easiest target. The ones that aren't a threat. I agree with that. What I don't agree with is your solution. Do you honestly think that a robber won't need any money if people around him are armed, or do you think he will work out a way to neutralize the threat that his intended victims now pose?
What robber would you rather meet? A confident one that believes that he can take your money and get away safely, or one that is scared beyond belief that you might be armed and could shoot him at any moment?
OK, see, now you've gone fully off the "criminal safety" deep end.
If the criminal is so scared, maybe he should try earning his money, rather than taking it by force?