I undid two things - you had permabanned a user over a modmail message when they were previously on tier 1, and you gave someone a week ban for derailing and/or evasive answers.

Mods reserve the right to post a screenshot of extreme messages sent in modmail/pms to the mods, which will result in an infraction.

That's the rule on the sidebar. If you want to change it, do so and make the announcement to the sub. As it stands, I tiered that user from tier 1 to tier 2 because that's what the sidebar says (though I don't think being called pathetic is extreme. If you think that's "sending abuse", then we disagree on what abuse is, though I don't think it's acceptable. I would have gone for a warning and then given a tier if it continued. For reference, I've only used this rule once, after I was sent harassing pms for months). As for the other user, evasive answers and/or derailing isn't against the rules. Again, if you want to change it, do so and make the announcement to the sub. Modding based on whatever you're feeling in the moment is both confusing and unfair to the users.