I'm not the only one on the forum who thinks that the problems surrounding reliance on default trust have caused more harm than good. Here's a well-written summary of some of the issues:
https://bitcointalksearch.org/topic/m.11725411There are many more posts detailing many more problems with the current system, but I can't index them all for you.
Instead, I started this thread to let everyone know that I've taken the step of removing default trust from my trust settings, so I'm starting blank, and I'll add people back to my list as I feel I can trust them. I'm encouraging others who have done this to post in this thread to let everyone know.
One sneaky, technical detail of this is that if you try to blank your trust list completely, default trust gets added back. So you have to either:
1) put "~DefaultTrust" onto your list or
2) have at least one trusted person other than yourself on your list
in order to actually remove default trust.
Many good suggestions have been made for improving the issues caused by default trust, but none have been implemented. I encourage people to "vote with your list". Remove default trust from your list and encourage others to do the same. Then post here that you've done it.