I just dont see how people justify using a .22 for any kind of home protection. Unless your using it in a SHTF scenario to kill small game for eating. I mean dont get me wrong, you shoot me with 8-10 rounds of .22 out of a walther or other small gun its going to hurt and possibly kill.
It still is one of my favorite plinking rounds. I loved my gsg that was suppressed and my walther that had a can on it. Always neat to shoot squirrels in the backyard and the neighbors not knowing whats going on!