HN is the most intelligent and open minded online community of this size that I know online. I have deep respect for you guys and girls and your opinions are always enlightening and thought provoking. I really feel much smarter because I have access to all these very valid points of view that you are surfacing. But even this community suffers from this strange phenomena of "group think" which leads me to go into this…
To motivate myself to finish the comment I know won't be taken well in the average I first remind myself that the point of my comment isn't to cater to the consensus of the majority of the HN crowd but the reason I started writing it was because I felt something needed to be said and if there is one other person who finds my comment valuable, I have succeeded regardless of everything else. Secondly, in entering the game of negative karma I expect downvotes with the idea that the more I get the more sure I am I did strike the right chord there. It doesn't always work and I get a wave of upvotes instead, but you get the idea. I rarely look back except when my karma changes a lot overnight which is when I might take a look at what happened.
Note that I don't, or at least I don't intend to, troll, insult, or talk off-topic in order to hog downvotes for my game. The downvotes themselves aren't the goal: I just consider them an indicator of success when writing a comment I'm pretty sure I won't be getting many upvotes either. It's like targetting controversy. Ideally, I aim to make remarks that question the status quo or find blind spots in collective assumptions.
To close, I'm thinking about your question in the end. I think that self-censorship is about the need to belong. If you're an independent individualist you have no need for self-censorship because you don't care if people were to oust you because of what you said. Yet humans need that feeling of belonging which I think is best reserved for people closest in your life. You can shrug off a lot of thoughts when it comes to your spouse, your kids, or good friends -- thoughts that you could defend and question till the end in principle, but because principles are merely mental tools you know you can afford to shrug off a few of them as between you and these people you (hopefully) have something that goes beyond mere mental gymnastics.