I've removed quite a few negative and neutral feedbacks lately in an attempt to try and spread more positivity and limit negativity.  Unfortunately, I've already had to add one back for a user who immediately began harassing me after I removed a feedback rating for them threatening to physically harm me.  Sometimes being the bigger person doesn't pay.  I don't have the answer on how to fix this problem, but am a firm believer that if the negative feedbacks were completely removed it would not result in more scams being pulled and would also likely cut down on scam attempts as newbie scammers would stop getting engagement from established users making them feel like they are getting some sort of results out of their effort.  Another bonus would be reduced spam as these newbie wannabe scammers would stop having to create and establish new alt accounts constantly as soon as they're discovered by the "spread hate" crowd.  At some point I hope these abusive negativity spreading users realize they're only training newbies how to avoid being linked to their scams and that their attempts to save the gullible are realistically training otherwise harmless scammers to be better at what they do.