If you think like that, then why not just delete these boards, since they're not Bitcoin-related ? Except Games and rounds, where there is something to say, and even, I would personnaly keep it, the other sections all have something interesting.
I don't find the Politics & Off topic sections discussing anything interesting but wouldn't want these sections to be deleted as they must have been introduced so that members can contriubte something useful. Users chasing activity points and misusing these sections would stop to an extent if these sections don't add up any activity points.