Well, that's what happens when you stick your dick in the pudding with constant attempts to establish a government in a place that doesn't want one. If the UN and US weren't feeding cash and support to the so-called "government", it wouldn't last long, many of the warlords would cease, eh, warlording, and the Islamic extremists would cease to have reason to exist and would ultimately disband.
Cock-up before conspiracy is all well and good, but sometimes, they do do things with malice aforethought.
(I'm saying they know what would happen, and are doing this on purpose)