I am guilty on red tagging plagiarism. But, I have my reasons on doing it and of course I reported them.
I believe you brought my previous topic in here because I have locked that thread. I don't like having similar threads open that's why I locked that one. sorry for the inconvenience.
Back to reply, The trust system isn't moderated and you're free to not trust someone for whatever reason but when it comes to some offends there are better solutions
e.g
ban evasion is a violation of forum rules so should be reported to moderators. There is no need for red trust for rule violations except perhaps in rare cases, for example someone is spreading malware while moderators are asleep - you might want to put a warning on user's account until they get banned.
I understand your reason, you have experience and I'm sure isn't all defaulter you red tags but selected ones. Although I'm just informing newbies so they don't think it's appropriate to do so.