I remember there was a time when I declined the 9mm based on the argument that its ballistics are such, that unless you hit a vital, it would pass right through "a crackhead on a mission". That was maybe 20 years ago.. Today, everyone loves the 9mm. Has it been improved that much?
I think the recent flooding of new shooters has assisted in the new found success of the 9mm. That and cost efficiency. Like I've always said...they'll all kill ya deader'n hell.