Well, as you accept, its controversial - ambiguously understood. Maybe those people are idiots, it doesn't change the issue - there are idiots (or naive or poorly educated people) in this world, they have to be accomodated in terms of whats allowed in the public sphere.

You absolutely can be held responsible for writing such things, even if you put a disclaimer on it. Some people glorify or identify with monsters, even if they're presented as such - some people like villains in movies. The ambiguity is an issue easily avoided by banning the book - nothing of value would be lost.