Absent a common enemy, they turn on each other. Just like Islamic sects.
Boy is that true. Back when I used to care, 30 something, there were 72 different sects of Islam in the greater Middle East area. And they were all killing each other. Once America pulled out, they literally did not know what to do except to kill anyone everyone, they did not care.
Yes, Islamic sects seem to live to kill. And they are non too picky about who it is to deserve Death by Allah including themselves...Allah hu Akbar!!!