I included TECSHARE for a moment to my trust list and got this as result:
~snip~
Fuck, I shouldn't have changed that feedback, you tricked me, I almost ended up negative and my reputation destroyed because of you troll.
There is no reason you should have included him to your trust list, because you don't trust his judgement. In that case also you would have only appeared negative to yourself, or seen your profile the same way anyone who have included TECHSHARE in their trust list. I'm sure you know this.
In general though if you were so inclined to include TECHSHARE hypothetically, you would then open a discussion with them about users on their trust list you disagree with. That's one of the base points of the new system to allow for discussion and resolutions. Then you decide if you want to keep them there or not.
Changing the feedback was the right thing to do, and this doesn't change that.