I was taking the point to an extreme. You're saying a society should support free speech so Facebook should let the white nationalist content stay on their site

I was taking the point to an extreme. You're saying a society should support free speech so Facebook should let the white nationalist content stay on their site (by their own good will, not forced by government). Is that not accurate? Deciding what I allow on my site is an exercise of my free speech. Why is hosting white nationalist free speech more important than my free speech to not host racist content?