[grzm]

There are some anti-abuse features on HN which cause some new accounts to be banned when they're created. Such comments will be marked [dead], not [flagged][dead]. I suspect that's what's happened with both 'hncensorship and 'throwaway12395 (though I didn't see the status of the latter's comment before it was vouched). Some people get caught by this feature unintentionally: if they suspect this is the case, the mods have been very open about whitelisting such accounts. You can email them via the Contact link in the footer.

Note that this is different from people being flagged or down voted by members because of content. I can imagine it's very frustrating, but they are different behaviors. In one, specific action has been taken by members; in another, one has been caught by automated anti-abuse measures.