I'm disappointed that the parent comment, which offers constructive criticism, has been downvoted at least five times (though, to be fair, upvoted at least twic

I'm disappointed that the parent comment, which offers constructive criticism, has been downvoted at least five times (though, to be fair, upvoted at least twice). Please don't downvote comments just because you disagree with them. In the context of the OP, I felt that several opinions about Bitcoin were expressed as fact, but I appreciate cperciva's polite replies and have upvoted them accordingly. This is because I believe that all polite and constructive comments (even when critical) deserve to be upvoted, or at least not downvoted. I hope in future other HN readers will extend me the same courtesy.