Also: beware the subtexts of brief statements about the rights of white nationalists that begin with "we must".
However, there are precedents in the law that show the US government prioritizes Free Speech over property rights. In 2018, allowing someone on your site is more akin to letting someone walk on your sidewalks than running a printing press for them.
If you're confident I'm wrong, can you please provide a cite?
There's Pruneyard, in California, which controls only in California and has been steadily whittled away by the California Supreme Court for decades. The trend in US law does not appear to be towards more expansive expropriation of private property to enable protest. Much more recently, Lechmere v NLRB held that private property owners can't be compelled to allow protests by non-employees (the employees of the company we're talking about have strong opinions about Gab in the direction you don't like.)