Except of course people who get it from contaminated blood transfusions and that sort of thing, those people have no blame or fault in your model but are still going to die slowly and painfully.

Indeed, I recall reading a fine theory about this. Suggesting that trust was built over time between an individual and a group by appropriate stages of revelation about themselves and their past. It also included the fact that inappropriate revelation (i.e. too much information too fast, too little too slow, just stuff the group didn't want to know) raised distrust between the group and individual, on the basis that it scared people basically.

Wish I could recall the name of the idea, but then psychology and sociology are topics I've merely dabbled in so I can't... still interesting idea none the less.

However theres also the idea that being totally open makes you immune to a lot of smear campaigns as you openly admit to everything, but I suspect that most people this is targetted at couldn't take that kind of exposure (I'm fairly sure I wouldn't want it) and also the negative consequences of making all that information available to various fraudsters is also a bad point.