Except that every crook they catch trying to break the law will say he was trying to expose another crook, but the cops got in the way. How is anyone held accountable? I think since they did not buy baby parts, and they released their videos, they should have a solid first amendment defense. Had they been caught before they released the info, I think their actions could be more realistically questioned.
You make a good point. I would just say the evidence is what substantiates accountability. “You were trying to catch a crook? Whom and on what basis?”