Liberty City is the most aggressive city even though LS should have been that. I mean come on, the gangs are taken to over the limit, they attack you for no reason (Yardies, Cartel) in LCS and they all hate you after you do one small thing against them, like first mission against them. That's crap, SA was more realistic, the Ballas doesn't have their guns ready up for shooting already once you have entered their turf. It takes time till you get their attention.