So why did Dayton get banned?

A link to a specific post with an offense in it would be nice. It would be nice to know Bickendan just didn't have a bad day and was abusing his mod powers again.

Here we go...

Dayton was banned under Rule 8:
8. In General, Don't Be A Complete Asshole.
At WordForge, we value free expression; more so than most other sites. However, the aim here is to have open debates, and fun. The aim is not to figure out a way to break the site or its community beyond repair. Free speech is part of a triad of what we value, and depends on its other two parts: including individual members, and overall community. If your use of free speech interferes with either of the other parts, there will be consequences, including but not limited to anything from warnings to temporary or even permanent bans. We trust our staff to make that call. If you feel that you do not know how to avoid being a complete asshole without a set of detailed instructions, this might not be the right site for you.

Yep.