However labeling an action before it is confirmed, is kind of extreme. Its like... Castrating a child because they may give birth to hitler 20 years later.
If we were to tag scammers only after they scammed, this place would be overrun. Trust is useless once someone has scammed! It's trivial for a scammer to make a new account and do it again and again.
By recognizing the signs of a potential scam, we tag in advance and stop them from happening.