>To me, the TOU standard should be applied equally.
The only place you will find that imaginary panacea is on a site that takes in maybe a few dozen posts a day. Any expectation of that on a site that takes in over a hundred thousand posts a week are mismanaged expectations. Untold numbers of users have started their own sites with the goal of building a better terms compliance/enforcement mousetrap. I've yet to see one accomplish it.
And why should Greg S be banned on a charge that IMO amounts to civil disobedience? Just because Greg personally rubbed YOU the wrong way?
The licence plate example you used was public display on public property. This is a private business, not a publicly owned street. Is a restaurant, grocery store, bar, theater, sports franchise, or any other private business obliged to continue to allow a patron to remain if they are constantly engaged in "civil disobedience" or abusive toward the operators? Of course not. They are free to have them take their business elsewhere.
If someone as antagonistic towards the site as Greg has been can't find the door, I believe we have every right to show it to them.