I think that is impossible professional traders always earn, even if they are professional, they will make mistakes someday, because they are human, not robot. But i think the great thing about them is that even though they make mistakes, they can quickly adjust to complete the counterattack.
Yes, that's right, because I also very rarely see professional traders complain when they make mistakes accidentally, because no human being wants to make mistakes on purpose for himself, moreover it can cost him / herself a loss.