Because violence is the solution to everything, amirite?
I am not saying violence is the solution for everything. But sometimes it is the only solution. Most people will listen to reason, even drunks. A normal leader would accept aid, trade, and further deals that would be beneficial. Then you have people like Vladimir Putin, Kim Jong-un, and Mahmoud Ahmadinejad that they are violent personalities that any friendly reasonable gesture is a insult to them and any violent one is a threat to there Alpha Male mentality. So unfortunately the best options to deal with them is hitting them with a huge ass stick.
That's why honestly the best option to deal with Kony is to send in Seals, Green Berets, and so forth. And if America doesn't want to help then its up to British SAS, German KSK and GSG9, and French GIGN to hunt the man down and put a bullet or two in this man's head because if we take him alive he won't get punished for his crimes.
Remember, "Speak softly and carry a big stick."