Unibomber Manifesto (1995)
washingtonpost.com
washingtonpost.com
> In order to get our message before the public with some chance of making a lasting impression, we’ve had to kill people.
I can't really argue with this, I doubt this essay would have reached as wide of an audience as it did if he didn't kill anyone.
Not all cranks are in this category, but there are a few.