Too many, all across the spectrum, have his mindset that people that do or think things they don't like should be destroyed and locked away from "civilized society." A common rebuttal I see from these sorts, after being questioned why they don't take it upon themselves to sit down and understand one another (I will concede there is a very very very small minority that this shouldn't be done with, but you're unlikely to ever interact with them), is that it's not their duty to help these people.

Unfortunately, this makes the issue worse when you start exiling certain groups and radicalized with hate.

Here's an interesting article (isolated incident) where those with extreme views were shown compassion and understanding, and ultimately disavowed their ideas:

Black Man Gets KKK Members To Disavow By Befriending Them: http://www.huffingtonpost.com/entry/black-man-daryl-davis-be...