As well you become DT member, now you need to grow a thicker skin to accept this kind of untrusted feedback. Because when you leave red trust to some one , may be they will also leave a negetive feed back. It doesn't reflect on your trust rating you know very well. So forget aboutunteustes feedback, let them do it.

You can send green trust any one if there is appropriate reson. If some one have green trust there is reason on comment. It might be for dealing crypto or for behavior. You leave green trust means you trust him/her for a specifics reason. If you leave green trust for like "Helping new people to understand forum"  or " Fighting against scam/spam " , This green trust doesn't mean some one can dealing money with him/her. Absolutely it's not abuse of green trust. Because you leave green trust appropriate and a specific reason.