Nah, I'm sure mods/global mods/admins without DB access cannot remove the trust ratings. Only theymos/people with DB access can do so, and I'm quite sure apart from a few spammers (who left negative feedback to over 30 people to extort them to pay to remove the ratings), no ratings are removed.
That's good to know. Wouldn't be to allow them to, a lot of mods do business on here. Most users will look at who left the negative feedback and not just that it's there if you only have a small amount anyway.