In fact, hero folds and villain opts to show QQ.

I know (now), that folding the flop would have been the right decision. In fact, I made a mistake. (Which is undoubtedly the reason, why my play is not profitable.) However, nobody answered my question on the turn:

After a mistake on the flop, was it a mistake to fold on the turn or would a bluff-raise have been an even bigger mistake?