You don’t have to be the villain to admit you played a part.

There is a belief that owning any share of something means accepting the whole of it, and that belief is what stops people owning anything at all. Most situations have several contributors, and naming your piece is simply accuracy about one part of the picture. It does not hand you responsibility for the rest.

Try saying the specific thing you did, with no general verdict on yourself attached. Not that you are terrible, just that you did this and it had that effect. Keeping it narrow is what makes it possible to say, and it is usually enough.