Violent and morbid are two different things. Only morbid games were locked, unless the violence was present to an extent that is not acceptable in a forum game.
There was a thread on this somewhere deep in the dark depths of "Support and Suggestions". I think there should be at least a standardised rating system where the poster of a game can flag possible issues such as violence, sexual and drug references, adult themes, strong language, horror etc.
We could leave it up to them to be accurate- that's part of responsibility. This seems to be the minimal standard on most sites of this nature.
In short, I don't think they need to be locked but gamers ought to be able to know what they're downloading.
Forum games are fun when you are waiting for more flash games to come out. However, we have to be able ot keep them clean and not overly violent or morbid.