Generally, people only need their dog to bark to be able to protect their property. Most guys with these type dogs have some sort of wierd ego thing going on, or worse. Who in the world would even want to own some animal that was prone to kill "anything" if it got loose. I would worry night and day about something like that.
I have a 10 yr old girl n a a border collie. I'm surrounded by Pitt Bull owners. They get loose all the time bc they dig under their fences. From my window you can see that he got giant rocks, cinder blocks to keep the bulls from digging out.
My mild mannered Border Collie plays chase through the fence with them. To him it's a fun game... for them it's a " if I get out your throat will be ripped!"
I know they can be nice if raised correctly but in my experience they are dumb killers...that bark are everything non stop!!