Is tolerance the root of democracy’s Demise?

Karl Popper, a famous Austrian philosopher of science from the 20th century put forth the thesis that too much tolerance is a bad thing. 

Is it? 

Watch the Vice Media coverage of the Charlottesville Neo-Nazi gathering/protest below and assess your position on tolerance and censorship: 

https://news.vice.com/story/vice-news-tonight-full-episode-charlottesville-race-and-terror

Questions to Consider: 

1. What arguments exist that the group should the group NOT be tolerated? I.e not allowed to protest and spread their ideas?
2. What arguments can you come up with that the group should be tolerated and allowed to protest and spread their ideas?
3. What dangers exist in letting the group speak? What dangers exist in preventing them from speaking?
4. How would this issue be viewed from a utilitarian perspective? How would the issue be viewed from a Kantian perspective? 

Popper’s argument against too much tolerance is summarized below, what logical fallacy could you argue is present in his argument? 

And lastly, let’s return to our title question: is tolerance the root of democracy’s demise?