Why are users banned for trolling when the site rules don't prohibit trolling?

THE TD.COMMANDMENTS

1. DO choose your user name carefully when you first register. Search the Member List to check for names that are similar to yours.

2. DO NOT “flame the board.” “Flaming” is the deliberate act of creating a post in order to incite members of the board and invoke a negative response.

3. DO NOT expect any tolerance for statements, opinions, or views that are bigoted, racist, sexist, or hateful. Further, linking to sites that contain such content is prohibited.

4. DO NOT engage in personal attacks on other users. Healthy debate is expected and encouraged, but take the childish insults elsewhere. This is particularly true with regard to visitors from other schools. Moderators will be especially watchful for verbal abuse, ridicule, ad hominem attacks, and stalking.

5. DO NOT engage in baseless criticism of LSU athletes, coaches, administrators or recruits. Legitimate evaluation of a player's performance or a coach’s ability is allowed, but personal attacks and insults are prohibited.

6. DO NOT post ANY adult or sexually explicit content OR links to adult or sexually explicit content.

7. DO NOT post images that contain the following:

Nudity or strategically covered nudity
Sheer or see-through clothing
Lewd or provocative poses
Sexually explicit acts
Close-ups of breasts, buttocks, or crotches

Also, threads that do contain acceptable babe images should have "NSFW" (Not Safe For Work) in the title.

Do not link to acceptable images that originate from porn sites or sites that contain adult content. We suggest you use an image hosting site to host your image before posting them here.

8. DO NOT use excessive profanity. Profanity is discouraged, and depending on the context in which it is used, might result in removal of your post.

9. DO choose a subject line that accurately describes the content of your post. Do not use deceptive subjects to attract attention to your post. Do not use one or two-word subjects that provide no description. And do not post in ALL CAPS.

10. DO NOT threaten another user with physical violence or retribution of any nature whatsoever.

11. DO take a minute to check for an existing thread on a topic of interest to you before starting a new thread.

12. DO not posting anything that could potentially harm (or embarrass) LSU or TigerDroppings.com.

Enforcement of these rules lay with the board administrators. Violations may subject the user to suspension or, in some cases, removal of the user’s account.