Other DT members may counter with neutral or positive ratings where appropriate.
Interesting addition: I can indeed imagine leaving a positive feedback when an otherwise trusted member gets negative feedback for no good reason. But for other cases, I'd stick to neutral only.
"If you wouldn't give them a positive trust without the need for a counter, don't give it to them with a counter" seems like a good line of thinking.
Similar to way back when people would give no-collateral loans vs. "account collateral"