And would that ruin your precious shooter RP? A random shoot out /should/ be a last resort, a full blown war should be a last last last last resort.
If you think the Bloods and Crips fight each other because of a little bit of disrespect then you shouldn't even be involved in this discussion.
OR how about considering a NLR where you can't take part in multiple shootouts in a day if you get shot? Since this is a realistic server, I can't imagine Jermaine the corpse can shoot too well. Then you can put some thought in to the fear of being arrested? I mean you're roleplaying a real life person, right? I wouldn't want to be in prison for any reason, let alone multiple homicides.