It's not censorship at all, it's the moderation of the forum maintained by the company. If I would maintain my forum I'd also delete the comments that are aggressive, overblown, conspiracy-insane etc, for example. I'd also know it's hard to win: only a few weirdos (and internet makes it really easy for them to be visible) are enough to waste the time of more people, but it's still a nice goal: better a few people on the payroll deleting the comments than the thousands or even millions of users being distracted, creating the new conspiracy theories or organizing lynching.

http://www.penny-arcade.com/comic/2004/03/19

In short, "do it in your own forum, I reserve the right to delete your posts in mine, and by participating, you're acknowledging my right."

If you did any real-life engineering, you know there isn't anything that can be produced without any glitches. You are aware that your product isn't perfect, but you still wouldn't want to support aggression in your own forums. Due to the different laws in different countries, who should you personally contact to solve the problem varies so even such answers in globally-read thread which should be purely technical can be inappropriate. In European countries it's very regulated and clear, for example. I don't know how it's in US.

What's certainly clear is that nobody would even want the forums without the active moderation, except the spammers and the insane.