there is an "show adult content" button in the settings. Which is off by default (I think).
So any children or other sensitive groups would be safe from NSFW content unless they specifically choose to turn it on. If you choose to specifically view it. Then thats the users choice.
Personally, I am strongly against censorship, and regardless of avarage quality, if there is even one good thing in there, and seeing it in the first place is OPTIONAL, then it should stay.