If so why? I see so many comments that are shocked at the content they see on this site. Why not just filter the search with tags?

I think it would be possible to add a comment search function by keywords or tags, because not all posts have comments. This would bring variety to the site's search engine

Because the blacklist still lets a lot of stuff through in the comments tab and tons of people can't tag or don't bother tagging right away or ever.

Come to think about it, I've only done manual searches for different things I want to look up thru the post pages and forum pages that people post in the forums sometimes, but I don't think I've used the comments, aliases, artists, tags, and pool pages for looking up stuff since I haven't tried using them that way and I don't know how to use them like that in particular for those anyway. I mean sometimes I use the wiki maybe to look up a term I don't understand sometimes and look thru other peoples account pages for some stuff too.

Sometimes yeah, to just look for interesting content and to see if posts are properly tagged.

I mostly use the manual search.