I didn't mention harassment in my system. Misquote?
Sometimes users plagiarize/ban evade and moderation is slow. We know how slow moderation is. It seems better to at least "soft-ban" these users first.
That was a misquote sorry! Fixed it
I guess so there's no harm in leaving the feedback but does seem like a waste of your own time to me.
Some other points for negative trust that I don't think were mentioned:
Unrealistic loan applications
This is exactly how it should be worded. No collateral loans/low value collateral are unrealistic loans but also as you mentioned do not justify a straight negative trust. Unfortunately applying sets of rules to leaving positive/negative trust is almost impossible to do due to it varies on a case by case basis.