Meta: I think the rhetoric of humility is more powerful here. "We are not perfect, but we can't stand by. We have sins of our own that we are trying to rectify

Meta: I think the rhetoric of humility is more powerful here. "We are not perfect, but we can't stand by. We have sins of our own that we are trying to rectify, but we cannot allow what you're doing." The flaw in mutual criticism without admission of guilt is that saying "we're good" even in comparison is so obviously self-serving that it gives your opponent a trivial excuse to dismiss you.