What's wrong is how others respond to "we are all imperfect" thinkers. Yes, even perfect beings make mistakes, and that one mistake leads them to total destruction like Adam, Eve and rebellious angels.
Being imperfect gives one a chance to correct the wrong, which means forgiveness from a bad decision one has made in life, a chance for redemption. It is something that perfect beings do not have; one mistake, and they are doomed.
This activist in question, not a religious leader nor representing a religion, is not perfect, but many are swift to execute him like he is somewhat perfect.