Jesus this turned to a shit throwing contest real fast, no, gangs in Vespucci shouldn't be removed, because if you look at the area of Vespucci where they are located, it's rundown, or at least parts of it. I agree, some parts of Vespucci should be relatively crime-free, but drawing a hard drawn OOC line of where crime is allowed to be done is just plain stupid, especially in a pedestrian area. Adding onto to that, arguing real life LA vs LS in-game doesn't hold up 1-1 either, because news flash, the real LA is more than ten times as big as the GTA map. If we're going to roleplay it 1-1, than no one should be able to drive up to Sandy just to have a beer at a bar, unless they live in Sandy Shores, because it would be a multiple hour drive, but, I guess it's convenient to shout "OH 1-1 realism is needed here and there" when it helps your opinion.
Most of the "low level" RP done in Vespucci is not done by factions, most factions in Vespucci keep a high-standard, so, simple solution, report those who are poor RPers, and stop trying to solve a niche issue with a blanket statement. If the issue is with the locals, why not, I don't know, try to socialize with them? Just because someone has a Hispanic looking name doesn't mean they'll kill you on sight, most of these people are just as willing to socialize with you as the rest of the people on this server. This is coming from someone who has a residence in Vespucci.