Well considering the amount of forums on the net where you can't even mention bitcoin without everyone who holds it swarming you - "Buy the dip", "This is good for bitcoin", etc. - I'd say everyone is pretty aware of the positives behind bitcoin and isn't too interested in hearing them regurgitated from yet another evangelist.

HN is a large community, with many people who have opposing views of many issues. I think you're experiencing a common phenomenon in large communities: you feel the people who disagree with you much more than those that agree with you. This is, I think, a form of confirmation bias.

downvotes == vitriol?

Bitcoin is good.