This is all discussed at length in past comments: https://hn.algolia.com/?dateRange=all&page=0&prefix=true&que.... If you or anyone has a question that isn't answered there, I'd be happy to answer it - but please familiarize yourself with the past answers first, because as far as I know it's all pretty thoroughly explained. Certainly that's the intention.
Also known as "wrongthink".
That's definitely not so.
If you see a [dead] post that shouldn't be dead, you can vouch for it by clicking on its timestamp, then clicking 'vouch' at the top of its page. There's a small karma threshold (> 30) before vouch links appear.
I didn't keep records. I'll let you know the next time I see it if I remember.
> You might be seeing accounts that we banned, especially if the first dead comment is dead for obvious reasons.
1 comment was enough to ban some accounts? Did you think I meant automatically?