I found the fundamental conflict here very confusing. It's about whether the Avengers should be bound to international legislation. The international community has already voted yes. If Avengers say no, they are in breach of international law. If they say yes, they are not. Obviously they should say yes, because if the international community asked them to do something they didn't want to do, they could still refuse and breach the law. The question is just should we decide right now to breach the law, or wait until a problem comes up?