You may be racist or nazi lunatic but still be a trustworthy person. Racism has nothing to do with trust.

Leaving trust rating for either racism or hair color is just a sign of stupidity. It also means that authors of these feedbacks don't realize the purpose of trust system and therefore they must be excluded from the default trust.

P.S. Death threats are not matter of trust as well. These are matters of either forum rules or the court system.