You think making a thread self moderated is the best?
No, this is not the best because whatever comment he doesn't like can be easily erased if he is not happy with the comment. And if op feels what he did is wrong then he can likely create his topic quoting what he has said on the locked topic then the discussion may likely continue instead of fighting on self moderated topic. Between locking a topic doesn't show a true statement where one can't be able to comment and share their opinion or possibly wouldn't want others to reveal the truth about the case.