I think that could be a toggle. Personally, I don't care if comments on my posts go unanswered if the general understanding is that I might not have seen it. But it seems right that if you posts something, you could choose to see all responses if you like. It'd probably go the same for comments.I'll say this: if I've blocked someone? And you decide they can comment on my posts anyway? I'm not going to post.
This is not a healthy approach in my opinion. The site doesn't run without you and you're opting to increase your toil and drudgery for little added benefit. I would much rather your main job to be doing stuff that is fun. Off the top of my head, what if new accounts had a "spam" button as well as "promote" and if "spam" gets hit a half-dozen times without "promote" getting hit, the comment gets removed? And if an account gets, say, ten comments removed it shows up wherever you look for such stuff to give you the option to remove the user?