I don't think there is anything wrong with this behavior -- I don't even see it being as prevalent as you make it sound. You can look through Wreschnig's activity and public reputation history and it looks like he's participated in one legal question in the recent past -- and for what it's worth, I completely agree with his comment there (particular the second part about there being several related or duplicate questions already). He's also provided some of the higher-quality answers to legal questions. It doesn't appear to me that he's taking a categorically negative stand on the domain at all; rather he's participating in the community in exactly the way it's designed to be participated in.
I think the consensus from our meta thread is that legal questions aren't off-topic as a general rule, but that does not preclude individual questions from being off-topic or bad. For example, I think the first question I linked to is off-topic because the question boils down to "how closely can I copy X without being in trouble," and X just happens to be a game in this scenario, but could easily be just about anything else. There's not a lot to the question that specifically ties it to game development that the existing general questions on the subject won't cover.