kifuusaki said:
Define Art.
[...]
True enough, art to one is not art to another.

You said it.

kifuusaki said:
But I do wonder if there is room for content guidelines.

And as per your previous statement, it's not our place to judge the content. We might not like it, but it doesn't change the fact.

kifuusaki said:
That's assuming people even tag their stuff fully and correctly. Blacklisting requires that a post I don't want to see, contains the tag...)

And that's a fair assessment. The blacklist does rely that people tag correctly, especially in terms of "extreme" content. However, uploaders who don't tag properly often get warned (and we encourage people to report such users), and repeat offenders have lost their uploading privileges because of it.