There are a lot of evils in the world, and a lot of people & organisations attempting (or pretending) to mitigate them. Choosing what and whom to support is, as you say, difficult. In general, and philosophically, I am usually opposed to suggested remedies which appeal to global concentrations of power (aka UN, USG, etc) to fix the problem. Global concentrations of power - first mercantilist empire-building and lately coporatism, have done a real number on Africa. Restitution for and remediation of that lies in a completely different direction from further military intervention.