Small price to pay. Sometimes we have to accept some losses for freedom.

"Some losses". You're essentially advocating for ending all moderation on the internet. No more forums, no more IRC networks, no more facebook groups or subreddits either. I guess that'll also kill or heavily cripple much of multiplayer gaming.

I guess everybody needs to learn to be okay with spam too?

What's the big win here? You can already run your own censorship-free sites without forcing your shit down everybody elses throats. Turns out, most people don't want that.

Moderation of a public forum is censorship

Sure, why not? Who cares? People come to HN specifically because of the censorship.

Some censorship is good, some censorship isn't.

Across the span of time, all censorship is bad. If you live long enough, youll eventually find that your closest held beliefs might not be what you once thought they were.