I think it is.
Feedback was appropriate at the time of leaving. So I think there is no need to remove it now. If they should be removed, positive feedback left on friedcat's profile should be removed first. He still has big green trust rating.
Exactly, when someone run a company for a long time and he receive a lot of valid positive trust but after decide to scam all the users he should only receive negative trust (without the cancellation of all the previous positive trust).
I think this thread should be moved in the scam accusation, it doesn't belong to the meta section.