If Breitbart or /pol/ are hosting discussions in the open between known Nazis or people who are advocating to take terrorist actions and they do not moderate and delete these things then yea they actually should be shut down. We would not tolerate this from Al Qaeda or with child porn so I really don't understand the problem. Nazism has caused orders of magnitude more suffering in the history of man than either of the previous things I mentioned.
> If Breitbart or /pol/ are hosting discussions [...] advocating to take terrorist actions and they do not moderate [...] they actually should be shut down.
> [...] shut down every communist site as well?
And you completely disregarded the conditions why?
You mean communists don't discriminate people they don't agree with? Take a look at any communist-ish state what happens when they get a chance to discriminate said people.
As for domestic terrorism, when was the last leftist riot?
Communism, as an ideology, disagrees with capitalism... and capitalism equally disagrees with communism.
However neither ideology discriminates against the other - a capitalist company will employ a communist if the individual is a productive employee, and a communist commune will welcome a capitalist if they strengthen the commune.
Individuals within both groups do advocate for violence against the other, but the ideologies do not. Contrast that with Nazism or literal Islamism - ideologies that explicitly espouses violence and discrimination against "the other".
That's the key part. Either you're one and fit the narrative, or you gotta GTFO in communism. You couldn't come to communist commune and establish a company or bank or invest money or whatever like in capitalist community. It's not like you could come in and own personal property as in capitalism either. The most you could do would be a closet capitalist and keep your ideas to yourself. But you could be a closet gay in nazi country too.
When communists came to my country, it wasn't pretty. Either become one and dropped property if you had anything worthwhile or you were fucked. To be fair, I don't know how else could they have attempted to install communism. But communism doesn't tolerate different ideologies on the same soil.
And today's communists do discriminate capitalists on day-to-day affairs. E.g. disregard of private property. Wether it's calling a gay person names or spitting on rich man's car, both are discriminating people that don't fit one's narrative. Ultimately, if either person got into power, they'd do harm to the other person or at least kick them out from the community.
Of course, somewhat personal action feels worse than doing something to property. But ultimately it's the same - discrimination based on one's ideas.