If all you mentioned was the fact that press doesn't check its facts, you might not have been down-voted. However, you almost encouraged others do that and boasted of yourself doing; that's what got you the down-votes.
a) I disagree with the fact (or policy) mentioned in the comment,
or
b) I think the comment undermines the HN community,
and in the case of a comment about lying to the press, both interpretations of the meaning of a downvote might lead to a downvote on such a comment.
Come on. Get over it, learn from it, and just move on.