Meanwhile people like butterzone go around every day leaving trust for people who don't even have any direct involvement with them, but my use of trust to defend myself from harassment was wrong. 
When the neutral trust option bubble was added a few days ago, I downgraded almost all my negs to neutrals as appropriate. I think all the negs I've left are now for the "I am a victim of this person, so nemo me impune lacessit" circumstances.