This is the first time we've had to deal with this, so I'd like to lay it out there (as well giving the user a chance to respond.
johne has posted three questions on the site, all of which have generated significant controversy and lots of mod requests.
The first one was about the parity lower bound, and became an unusually long question about the difference between EE and CS regarding the importance of circuits.
The second appeared to be a complaint about the use of contradiction/diagonalization in the proof of the halting theorem, and was closed for lack of clarity and concern about whether the concept of a contradiction was itself being called into question.
The third question to my mind seemed more genuine, asking if there were any constructive (my rephrasing) proofs of the Halting theoreom, but has since devolved (in comments) into a bit of a mud-slinging war. The one legitimate answer provided appears to have generated very little response from the user.
In addition, the user also answered a question about DLOGTIME and NLOGTIME with what appeared to be another discussion about differences between the VLSI community vs the TCS community, which I feel is not relevant or helpful.
This is the first time we've had such an issue come up, and I'd like to discuss how we should proceed. I was loathe to make this about the user (and not just about the questions), but I believe there is a sufficient pattern to warrant a discussion here. In each case, the specific issue can be resolved at the source itself using standard methods (downvoting/closing) so maybe there's nothing to discuss.