I believe if more than n people flag a video as inappropriate, it gets automatically pulled (where n is some unacceptably small number).

This doesn't seem like malice on the part of Google or Youtube - more like the standard douchebaggery that you see infesting the youtube comment pages.

Yep, videos are automatically taken down after a certain number of flags. I expect it'll be restored if/when someone at Google catches wind of it.

It's back up, with comments disabled: http://www.youtube.com/watch?v=iWYqsaJk_U8

And it's a very well made video.

Why is the number of videos by the user displayed as 0? Has it always been like this, or is it because the clip was reinstated?

It's because the single video on the account was taken down. The counter might eventually catch up with the fact that the video was reinstated.

Here is a mirror of the video http://vimeo.com/22474499

I'm surprised they didn't use Vimeo in the first place. The orginal YouTube posting had comments disabled, as you and I can both imagine what the thread would have quickly turned into. I can't see that being necessary at Vimeo.

Recently I reported a YouTube video that explicitly shows a murder. The video (and multiple copies of it) is still online. This video made the headlines in portuguese 'populist' media. It is really disgusting and I think that Google should really make this a top priority -- not promoting this explicit and real violence. What should I do to get Google's attention?

At a guess, this was due to one of the employees who talked about one of his suicide attempts when he was young. If so, it's somewhat akin to banning an anti-suicide video for showing the consequences of such an action.

A number of loonies made a campaign for youngsters saying: "do not believe others, being gay is not an option if you want to be a christian, you can be cured". This may be normal in some other countries but in Finland this kind of advertisement and attacks in Gay Pride is a quite new thing. I'm very happy Apple made this and I hope it helps some youngsters who are unhappy about themselves and what they are.

The video is still up, http://www.itgetsbetter.org/#iWYqsaJk_U8

These videos are notorious for being flagged by conservative types. It will be overridden and reenabled soon enough.