DT1 members are usually scrutinized and the abusers are removed quickly.   However, their choices for DT2 are tied to their own personal experience, even if the person in DT2 is a known scammer.

What if we stopped including DT2 members in default trust?  All of the BS trust issues that are floating around would go away.

But DT2 members, who are trusted by DT1 members, should have benefit as well.  Let DT1/2 members have a full signature and everyone else have restrictions. 

I know this is user experience vs $$, so I'm going to hold my breath.