But aren’t car bombs and public shootouts between different crime groups an unavoidable by product of existing organized crime? It seems to me there always be someone who thinks he can get more money by leaving a group and creating one of their own or some other group trying to expand revenue and territory

Not necessarily. Intra-gang violence can be done in more private ways, public terrorism is a choice but not an inevitability. Gang splits are also less likely to occur when the government is corrupt and working with some gangs but not others; the intra-gang violence can be disguised as law enforcement action and the overwhelming power of the government makes them a powerful ally that deters competition from even trying.