Fully agree with you, and touché on the glib use of the quote. I wasn't trying to invoke the full depth of Nietzsche. I'm merely cautioning against crossing the line between condemning disgusting actions and labeling the people themselves as disgusting. I'm appealing to humility and humanity: a recognition that we aren't inherently "better" than the worst of them. In order to be different from them, we have to act differently.
We don't have to agree, we don't have to sympathize, but failing to see their humanity no matter how unconscionable their actions blurs the line between us and them, and that's a line I prefer to keep as clear as possible.
I am curious what you see in my comment that is "libshit", though. I don't personally see how the invocation of human rights and dignity is liberalism by any reading.