That would make sense if they had any information whatsoever to judge them upon, other than the fact that I included them.
That's the whole point. If someones ratings start showing up as "trusted" in default trust or my own trust list, and I have no information whatsoever to judge them upon, then I can place exactly zero trust in those ratings. Therefore, I don't want to see them.
They have earned my trust and I have had long standing interactions with them outside of the forum, but I guess unless I get Suchmoon's approval first, I don't get to vote on people I trust.
They haven't earned anyone else's trust and they have had no interaction with anyone else on the forum, so why shouldn't other people be allowed to distrust them without you opening a thread complaining about it?
If you are free to add users who have left no ratings whatsoever except a single positive rating to you to default trust, then other users are equally free to exclude such users.