Almost all the civil wars in the world are taking place in countries with very weak institutions, high levels of corruption. And that gives people a motive to kill for it - even if they don't think they have a chance of winning central power. A lot of rebel groups can make pretty good money just by being men with guns. It's getting easier because of the internationalisation of organised crime. It's just much easier to launder the profits from this than it was a decade ago.