"Freedom of speech" is not a guarantee that you can post some a comment on some web forum and have it be seen, its a guarantee that if you do, and it is, that your government won't punish you for it.
I realize that freedom of speech in the US doesn't apply to private establishments, but I would expect HN to hold a higher standard than say a conservative Christian forum.
And keep in mind that one of PG's goals is to reduce the herd mentality.
Just because I named 2 dubious uses of free speech, "slander" and "assasination", doesn't mean that the laws can't be twisted to clamp down on more legitimate issues: such as revealing corruption in the government which can be construed as libel in the US.
Overall, I am disappointed in the attitude of HN readers like you who take freedom of speech lightly.