"What it takes is a monopoly on violence"
LOL, erm.... i think u mean a gubvment.... yeah, we already have that.
"a guy with a gun who's not afraid to use it to restrain violent groups. Ideally that guy is elected and held accountable himself so that he doesn't become an agent of war and oppression himself."
Oh dear, or...... we can just simply have armed citizens who can be responsible for their own safety, and that of others. Our retarded society becoming one of being afraid to take responsibility. People see others getting shanked, robbed, killed on the street, and instead of doing the right thing, and rushing to protect the victim, they cower, dial 911, and wait for the police to come 10 minutes late to a corpse. AND they think they did the "right thing" lol. No one wants to "get involved". Ensuring a monopoly on force will not lead to less violence, rather the opposite..