TL;D(id)R
So you feel that all users should be treated equal. I'm not convinced that I should treat Supa the same as Badbear. I would not trade with the former, but would with the latter. And on that same train of thought why should I not value the (trust) opinion of certain members over that of others?
What you're suggesting sounds silly to me. I do not trust those who have proven to be fraudulent and I don't value their trust feedback either. I trust those who have good track records on here more (though I will still do my due diligence) and I value their trust more. Now I pick those members myself, but I did base some decisions of the Default Trust list. It seems like a reasonable default to me.
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I agree that these DEFAULT TRUST MEMBERS have been able to stop scams with the help of their power to be in the depth 2 but what about the ratings they give only based on an assumption? Would they compensate for the loss the user has to bear as he/she has received a negative trust rating for no reason? Others would just go by their trust or some may give an argument that since you are blaming a default trust member, you are a scammer. They have basically stopped the legit users from selling their products or exchanging in this forum because of their trust rating which was just an assumption.
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As said before ratings are given based on the behavior of the user who's suspected of scamming and the experience of the user giving the feedback. Those on the receiving end can defend themselves. Can you provide an example where
1) someone was suspected of scamming
2) they provided information to show they were legit
3) the negative feedback did not get removed and
4) the person that left the negative feedback is (still) in the Default Trust list?