Yes! But then begs another... Moderators may 'downweight' a post... I'm curious what types of submissions a moderator might downweight. 'Popular but violates

Yes! But then begs another... Moderators may 'downweight' a post... I'm curious what types of submissions a moderator might downweight. 'Popular but violates guidelines', or 'Popular but too distasteful/offensive', or 'popular and really funny, but not consistent with HN ethic'. How much subjectivity is there in downweighting and to what extent might it be perceived as censoring, if any.