Aren't the scam accusation threads a better way to determine a scammer in the forum? If the accused doesn't come to clear his name in the forum, they could be considered guilty.
Scam accusations threads can't be used to determine a scammer, the fact that someone opens a scam accussation thread doesn't mean the person is right and the accused is guilty of the scam, and we also can't compel people to always come and respond to accusations against them. If the accusation thread has sufficient information/proof that they are guilty, then their response isn't even necessary, but if someone doesn't have enough proof against another, and requires the accused to post in order to clear their name, then they shouldn't start the accusation thread in the first place.
On the internet, I think Spam is worst than scam as moderators can detect spam themselves yet scam requires both parties to defend themselves.
I don't think so, they are equally bad, or scam is even worse because someone losses their funds, just that on the forum scam isn't moderated, and it isn't because spam is a worse evil, just that it is easier for the forum to moderate than scams, which they leave to the responsibility of users.