I actually bought an AR because they are safer than handguns or shotguns when it comes to over-penetration. I use Hornady TAP Urban rounds and I live pretty far from my neighbors. I also have a safe zone to retreat to and a firing zone that is backed up by a wall that has dirt all the way up behind that. That's the kind of thing that will protect you in court too. You did the best you could to avoid shooting someone.