Gah!

Is there anything you can't be warned/frozen for?
Bump getting you frozen? The only way I can see that is if someone is repeatedly bumping their board (like the posts with 10 bumps in a row) - that's considered spamming. Maybe a warning for that, and I guess if they keep doing it, then they are "breaking the rules after a warning was given". I know people have been warned/frozen for begging, but that seems to take mass reporting (which I do not take part in).
I don't understand how you can be frozen for something when you haven't even been on the site though. I have seen it before, but it just makes no sense. It's like getting a warning for something, but for whatever reason you don't log into that account for a few days -- you don't know you even got the warning. Then, you do go to log in only to find you've been frozen. Why? Because whatever the warning was for you didn't "fix" because you couldn't because you didn't know because you hadn't even been on the site.
As far as reading the reports before freezing, well, I don't think they always do. Especially in a "revenge" type of thing...Let's say you have a disagreement, argument, whatever with someone. They decide to report you and get their friends to do the same. You, 9 times out of 10, will be frozen. Not because you've actually broken a rule, but because someone decided to be petty. And who's to say that a person reporting a neomail or message won't "doctor" what you said in the report just to get you in trouble.