The entire purpose of the trust system, especially the default trust, is to provide exactly those people with a guide of who to trade with until they can figure that out for themselves by gaining experience trading and building their own trust networks. If you don't want this responsibility you should ask Canaryinthemine to remove you for the default trust.

Of course you won't, because it gives you more power to attack people who dare to question your use and abuse of the system. Additionally it makes it more appealing for people to trade with you because trust ratings you leave have more weight. You just want the benefits but not any of the responsibility included along with it.