Freedom of speech is a smokescreen for people like Robinson. They use it because it appeals to libertarian-tinged right wingers and liberals’ own sensibilities, but they aren’t interested in it at all. Consider countries such as Hungary and Turkey in which nationalist heroes have taken over, and are now fully engaged in suppressing, jailing, and outright killing opposition voices in the name of patriotism. If the extreme nationalists in your country are using the freedom of speech card that’s good, because it means their views remain toxic enough that the very best you can say about them is that you have the right to personally express them.
The first step to detoxifying those views is to deseminate them on as many platforms as possible, get sensible people from acceptable political strata to debate you on them, and get naive liberal journalists to write lavish interviews with you. It’s what they want, it’s their way in. Deplatforming and protesting them, meanwhile, hurts them - Richard Spencer had to call off his most recent US tour recently because too many uni campuses were willing to host him, a state of affairs he blames entirely upon the extreme left.
There’s also rumours going around that fascists are actually supporting the likes of Robinson being de-platformed, because it means they have no choice but to come on their own, in-house social networks. To which I say, good. Let them rot in their own hopefully well monitored little corners of the internet, exercising their right to free speech with each other, where it belongs.