Yes however, It's only promoting good.
You can only give somebody a negative feedback if it was during a trade where as if you insulted somebody or basically told them to fuck off which is rude and no body should do however people do.
Or if they're racist etc etc they should have a negative mark shown to the public on their account as well as the other stuff the moderators do (warning points)
Because trusting somebody isn't just decided on all the good, it's also decided on how they act as a whole and what they have done in the past.