They could literally end both of those things if they actually gave a damn. It doesn’t help their profits though. It costs very little to ban lolis, and they probably consider that a PR win for most of the population. So their reasoning checks out from a sinister villain perspective anyway.
i honestly doubt that the U.N. could end those but the Nations that reside in the U.N. could. This might sound like a stupid point to make but the U.N. mostly is a communication-forum, an effort to have nations talk to each other and to make working together easier. The U.N. might ratify something concerning world hunger or poverty but without the member states doing something about it nothing will happen. The U.N. simply has no power to force something onto nations. That is also why the U.N. will not be able to ban lolis. It is rather a comdenmation, which is also bad.
But yeah, i too see this as a pr-stunt. People are so infatuated with pedophilia-hate that they will turn their brain off at the mention of the word.