maybe now more people add more people to trusted lists, so many more people have reputation building or destroying power
I think you have a point regarding the increased amount of people on default trust. I would increase the minimum required to have light and dark green trust.
I'm not sure about requiring 2 negatives instead of one to make a profile red too. An option would be to make it red right away (in case a scammer in action was spotted) but make it neutral again after a while if no other trusted negative is left.
The system is definitely not perfect but it's
much better than no system at all or no default trust list at all.