Yeah. Key is a part of a game studio called Visuat Art's, which is why you see those two names oft together.
I'd like to say because drugs are such a big deal in Japan, but in reality it's because of Tomori Nao. For her the standard greeting seems to be to turn herself invisible and kick people in the face. When she wants someone to leave her in peace for a while, she doesn't ask them to step out of the door, she kicks them through the window from the third floor. So, yeah, she thinks extreme violence is a natural part of the everyday life of a healthy person. That, of course, is only due to what I said before: Humans have no value to her, other than as tools.