I cannot agree with what suchmoon stated though you agreed with him about "Don't neg-trust trolls so that people don't need to try to clean up your mess."

What suchmoon is saying (and you agreed to that view) is that in your opinions it is acceptable for users to leave positive counter-feedback for those receiving inappropriate negative trust. So the argument is simply saying "you did not use the trust system properly so I will also not use it properly either" and that argument is flawed. It is not cleaning up any mess, it is creating the mess or making it worse.

If one user has received what is deemed to be inappropriate negative trust, what exactly gives another user the right to breach the trust system and give a counter-positive trust rating? Can they justify it by saying "you left inappropriate trust and broke the trust system rules so I will break the same trust system rules (I otherwise uphold) by leaving a positive counter-feedback".

Using positive counter-feedbacks is a completely inappropriate use of the trust system and from my perspective it has no justification at all because if anything a neutral rating can suffice.

What I would like to see is what reasons will be provided by members that have already done or have contemplated adding users to their distrust list on the basis of making improper use of the trust system by leaving negative trust and quoting that reason yet they have not taken the same actions against members that leave positive counter-feedbacks. I will add this to the OP as well.