That's exactly why I carry one in each pocket. A thug wanted to shake my hand one time but he got a good grip on my thumb and wouldn't let go. I had my .44 magnum nearby but couldn't get to it. If that ever happens again I'll be sticking a .22 magnum or .380 in his right ear.
I have this one for my Glock 43, pocket carry. I'm pretty happy with it.