Not much of one. Both traffick drugs and use terror to cow the civilian populations. The paramilitaries tend to specialize in brute terrorization of civilians, though, and spend much less time fighting the FARC than the FARC does the Colombian Army.

The Colombian government in general, of course, is a far worthier cause and represents the Colombian people far better than the bloody dreams of the FARC high command. That doesn't mean they necessarily deserve $5 billion, not with the people they're in bed with.