That really is not true. I appreciated the post because it gave me a perspective on what life is like for people who aren't like me; it has nothing to do with politics unless you want to start arguing about politics.
I think it's more that his arguments didn't seem to have considered the situation he was addressing at all. Extraordinary claims require extraordinary proof, but he provided no evidence or reasoning at all. His comments were not particularly more substantial than "I like pizza," though their implications were a lot more harmful. I understand that you don't like to see unpopular opinions downvoted, but at the same time, vapid comments should not be protected just because they express an unpopular opinion.
It's not just this instance, I've noticed in an increasingly broad variety of topics that when something goes against the accepted groupthink it is prone to silent downvoting. Even in the absence of ad homs, whining in general, etc.
Also you'd be pretty hard pressed to say that this question isn't expressly relevant to the original article being discussed, and isn't overtly political in the sense that noone is agitating for votes or any such thing.
I was muzzled for arguing that Craigslist middlemen are bad. Then again I did say some things so out-of-bounds they should not be heard:
"Do buyers and sellers go to this man the way people go to real estate agents for their services? What would Craigslist buyers and sellers think of what he does if they knew about it? Respectfully, I think they would strongly prefer he weren't interfering."
That's exactly what I'm talking about, and the main comment I made that was at +4 when I went to bed last night is now at just +1 so I take it as fairly obvious that this people trying to muzzle well presented / supported positions that they happen to disagree with is really going on. http://news.ycombinator.com/item?id=3596880 also was in a tug of war between 0 and +5 for a few days but has settled now on +4.
Two in just the past hour with a quick look at recent comments + one 40 days ago where I noticed it first started happening;