So the software itself would not try to help me to decide how much I should loan to, say, a friend of my friend? And still, the damage of the network effect remains the same, albeit in a different way--an abuser can still manage to raise a huge amount of money by strategically placing himself in the network, surrounded by a large number of borrowing agents, and run away with other people's money.
There is very little difference between giving somebody trust and giving somebody money directly. As soon as you trust me, I can deposit your money at Bitstamp and leave you holding my IOU's. Don't extend trust to people without reason.
I'm starting to think that the language of Ripple needs revamping. People think that "trusting" people is a good thing, something you're supposed to do. It's not. Don't do it. It means something to the system, and "something" is "you can take my money".
That's essentially why I believe a software should not try to be helpful here, it's a completely human issue, a person should always take any lending activities seriously, come to know the person and talk to him/her, especially if it's someone you don't personally know. In fact, try to assess the counterparty risk of some unknown entities is just what all those MIT Ph.D quants in the Wall Street have been trying to do for years yet completely screwed up, and you guys maybe bringing more variables into a already complex formula.
Without Ripple's convenience people have been unable to curb their urges to lend/borrow(or you could call it invest) irresponsibly, which creates the recession we are now in, I doubt with Ripple it could be even better. If an abuser screws up hugely and leaves the network with a huge web of debts, it seems to me hardly any new capital would risk to get into it again. Bitcoin on the other hand doesn't have to face such problems.
Remember as a startup you have to offer clear advantages over the established, if people should be left to figure out if you have anything clearly desirable, they most likely will choose to stay with the established.