I think your downvotes mainly come on some of your political comments. Political threads are not great to begin with, and I think you're giving yourself some undue credit as to your participation to them. I commonly hear that HN leans liberal and whatnot, and that's probably true, but I wouldn't say that non-liberal (for severe lack of a better term) comments are necessarily dogpiled. I think many non-liberal comments that are downvoted here are done so for being in bad faith, because they may have a point but overextend their argument to other targets. I make it a point to not take sides and be critical of all opinions (of course I don't implement it perfectly), and I think I have been treated more or less fairly. I linked some political threads I participated in to demonstrate non-downvoted non-liberal comments. If some of my opinions are "liberal" and others are "conservative", I'll just say that I try to be fair and reasonable.
https://news.ycombinator.com/item?id=36523600
https://news.ycombinator.com/item?id=36653284
https://news.ycombinator.com/item?id=45573777
I only downvote people who I think are degrading the conversation who seem outlandishly wrong or off-topic. If I just disagree with someone, I may reply or not. It's reasonable to disagree on the basis of holding different values or beliefs.