The artist commented it with :

No reproduction or republication without written permission X(

This artist used to tolerate *booru websites, until she found her images on Danbooru were reprinted in Tumblr without artist information. Since then, the artist sometimes posts negative comments about us on Twitter...

I'm really upset that someone attacked Yagisaka Seto in some direct messages on Twitter, saying something like "Your thinking is wrong!"

Did my comment lead this idiot to the artist? If that's what happened, it's truly regrettable. I must give my apologies to her.

What's to be gained by going out of your way to spew insults at someone just because you disagree with them? That's the kind of thinking that's wrong.