I used to swear a lot as a kid but I only ever swear when I'm pissed nowadays and I also have very dark humor. Honestly, I can understand why adopted an emotionally unavailable response to most situations and I tend to do it at times as well. Just like you, I had a very horrid upbringing with crime and violence all around me and lost a lot of people close to me so it's how I tend to cope with some things in life when I can't do anything about it. As for the voice pitch thing, is it impulse or only when you get nervous?
I'm more like any wild animal, as long you don't provoke me, I'm not a threat to anyone. To be honest, I'd have a record as well as I've been arrested a few times myself. However, I never got charged because all of mine were in self-defense/retaliation. I never started any of those incidents so I got let go. As for the sense of humor thing, if you find something funny that I might not, I can't tell you not to laugh.