One of the nice things about dealing with lefties is that they tend to telegraph every move - and every feeeeeling. There’s no need to guess if they’re concealed carry - they will invariably tell you.
Another thing is that they can’t deal with an equal response. They assume since they are arming, when the shooting starts we will just sit and be shot. I doubt they are prepared to be shot back at in response. Look how they reacted when they got punched back at the rallies. They freaked out.