Similarly for email alerts. We do our best, but our email system isn't perfect, the Internet isn't perfect, and your email system probably isn't perfect. Don't rely on us when it is a matter of life and death. Has your desktop machine ever crashed? Well, so has our server. That's why we wouldn't bet the farm that this site would be up and running at any particular instant in time.
Decisions of content moderators are final. If you post something and thought it was witty and interesting but the moderator kills it, that's painful but it is better than everyone suffering with the miseries of an unmoderated forum.
We reserve the right to exclude users from this online community. The usual reason for exclusion would be that a person repeatedly posts off-topic or otherwise undesirable content and thereby imposes too great a burden on site content moderators.