It has nothing to do with flawless. Nobody is flawless. Even if they were, half the things people are now being condemned for aren't even rooted in fact.

You can't attack someone like Assange for revealing official misconduct. That's against the rules, and unsympathetic. But you can attack him for <something else>. The something else is irrelevant. It's only the proffered reason for the attack, not the real one.