Post History

I'd say if they (Q) were closed before, open them and give them a downvote, and if they get "enough" downvotes (3? 5?) close them. I would like the same for both Q and A. SE had a "review queue", ours would just be downvoted questions.

For answers, I'd say any answer with 2+ downvotes should be hidden (viewable with a click) and available in a review queue; deleted after five downvotes. As a programmer myself, I'd put a counter on the user's account to see how often they get hammered for Q and A on review, at some point they are just here to offend, or work out their psychological aggression, and candidates for expulsion. 

I agree with Mark about the structural issues with voting; i.e. the best answers (mine!) are often too late to get the most attention. Things I can think of to address that is to put the highest rated or accepted answer LAST, or leave them in answer order but reversed: The Newest answer is on top, whether it is accepted or the highest score or not. Or use the default SE sort and provide buttons to sort the answers by score or age. (I see this was discussed in the comments on Mark's answer.)

I don't mind moderators making unilateral decisions on OLD Q or A or comments. I wouldn't want to see this site get into the autocratic control mode of SE, but I do agree that we don't need to see spam, insults, racism, homophobia, misogyny, etc (unless it is a legitimate question or answer about racism, etc). 

There is a rather fuzzy line to be drawn somewhere!

I like the idea of community moderation and curation, supplemented by more professional eyes at times. The only problem would be self-serving moderation; voting down Q or A as part of the "game" of getting the most points. SE tried to fix that in their gamification by making the downvote cost you two points, but an upvote costs you nothing. 

I don't think discouraging downvotes is an intelligent answer though, then you have to sacrifice points to be altruistic and serve as a community moderator. A better answer might be requiring a comment to explain a downvote, instead of just accepting it. Review of the lame excuses a user makes for their downvotes could reveal that self-serving downvotes is the real pattern. So it doesn't cost points to downvote, but takes more of an effort than upvoting, you do have to publicly explain yourself. Which might, when moderating is the true motivator, help educate the poster as to what was wrong with their Q or A.