You seem to be implying that the only criteria for being in DT2 is the number of negatives sent. I think that's wrong.
No. I'm not implying that. But of course that's a factor, among several others
If a user barely leaves any feedback at all then I do not understand why he was considered to DT2 in the first place
The DT1 member trusts the judgment of that person. What's wrong with that?
You're really starting to go off the rails with this one. What difference does the number of feedback ratings make? Is there a quota that a DT2 member is supposed to meet? Does the DT2 spot cost money to the forum?
The counter argument is what use is trusting the judgement of that person if that person never/very rarely exercises that judgement to leave trust ratings (positive or negative).
Just playing devil's advocate.