This situation has been self-perpetuating for decades, and all because the leader of the rebel army has not been stopped. There is no longer any real revolution going on, by all appearances, but merely a ragtag group of armed and half-crazed men forcing a large group of children to do their violent bidding, and a government that is at once largely powerless to stop it and at the same time not overly concerned. There are definitely resources available in the world that could bring an end to the situation in Uganda, however -- through direct military might, if necessary, and through increased aid to the largely peaceful people and communities of Uganda in order to eradicate any...

Better schools and better general infrastructure -- access to water, nutrition, and healthcare -- would eliminate the perceived need to overthrow the government, which at this point is little more than a simple excuse for the rebel army to pillage and act as it wishes with a sense of self-righteousness.
Singer was writing decades ago, and did not address this issue directly, but the same principles apply here as in other issues in the developing world. While we stand by, or rather actively pursue other ways to spend our energy and money, we are failing to uphold the moral good by stopping horrific wrongs from being committed.