A constant problem is either an apathetic or even active citizenry supporting those perpetuating the butchery. They either don't see it as their problem or see a schadenfreude like glee in seeing those they deem "subhuman" or unworthy of respect being treated like scum.

Terrorist attacks won't fix that... but I can see how the downtrodden might see it as just desserts for people who help keep them oppressed.