Underground arts? You mean like the violent type of pictures? I can tell that you have your opinions and you want it that way. The type of "kiddy" picture you should be complaining about is the My little pony types of pictures around here.
I don't really think that dA was for just kids lol. I see nude and gory pictures here sometimes.
I don't even see why this is a "child" related picture o-o; Is it cause its too bright for you?
Ahh I see. People do seem to have a problem with Anime and the "Cutesy" pictures But I can't argue that they have their opinions like you. But, an adult can search up underground art and have a poster from that lol