“why not go after the countries that supply these soldiers, since they are the ones with the responsibility for punishing them?”

Precisely. Why won’t UN go after them?

UN “peacekeepers” all wear the blue helmet. Don’t think UN has no responsibility here. For the sake if its mission in the world, if not its own credibility, UN should be the FIRST to expose this kind of abuse and to demand that the offenders face justice in their home countries. But UN hides from this responsibility. So someone else has to do it.

BTW, that’s one good reason freedom of the press is so important.