There is nothing wrong in telling what do you feel about something when you are asked. And there is no problem in expressing an unpopular opinion on HN as you can sign-up anonymously at any time and just share whatever thoughts you want.
Anyway, hesitating to say something is not always the best idea, maybe it ought to be said aloud while everybody hesitates.
People are social creatures, programmed to respond to approval and disapproval from others. This includes replies as well as votes. It's irrational, but that's who we are.
Now, try registering an alternative account on HN and write political comments, polite, articulated, and reasonable, from a conservative point of view. What do you think the response will be like? Will you feel encouraged to proceed, or will you feel (emphasis on "feel", as these things are emotional and not rational) that you'd rather not continue with your point of view?