When individuals agree on basic absolute truths, they are organized into a social group. When a few individuals deviate from what the original group agreed on to be absolute truth, and the remaining individuals who do agree with the originally agreed upon original truths say that those people are not "one of us", even if the dissenters shout "we are part of the original group", it's obvious to everyone that they aren't. This is also true of the Protestants (Luther, Zwigli, Calvin) and all heretics before and after them. But it's just as true for those in the Church who do evil, because even though they aren't committing formal heresy, they are showing by their evil actions that they do not really know the God that we teach, because otherwise they wouldn't be doing evil. That's not to say they aren't formally part of the Church -- the Catholic Church is a hospital for sinners just as well as a museum of Saints. But these evil people don't at all represent what we teach, because they don't follow it. I myself have done plenty of wrong in my past and I have no excuse except that I was a poor excuse for a Christian, and I did not represent what my holy Church teaches, and for that I am deeply ashamed. But that doesn't change that what my Church teaches is true, even though I did not understand it correctly it apply it to myself well.