>>/19696/
After WWII Russian weapons were adopted widely both by the military and the police among them smgs and these were upgraded to AK variants later. Supposedly the 7.62 is too strong ammunition for the police, I watched some videos of Paul Harrell (I mentioned him in another thread, channel here: https://www.youtube.com/channel/UC6QH13V2o68zynSa0hZy9uQ ) and in some of them he shoots targets behind cover (e.g. wooden, concrete etc) and sometimes the cover is just destroyed by a few shots, depending on the ammo (and barrel), so I guess a shootout with AK's could claim more innocent victims accidentally.
I find your remark on the usefulness of smgs in WWII inaccurate. Even in WWI rifles were outdated - from today's point of view - as they have unnecessary long range and they are only capable of single shots and the armies needed more dense fire and not more accuracy in a range where smgs were passable (but not optimal I give it you that). More on this later.