Great posts here.
To get back to Dryad's original point, I think perhaps her negative view of the climbing culture is more in the eye of the beholder. I think her well chosen words speak directly to the point:
"it's hard to get any kind of real sympathy."
There are often expressions of sympathy after the accident reports; however, noone thinks much of them as real sympathy, but more as rote condolences, since the poster doesn't know the victims or their family any more than we know Elvis. On the other hand, if something negative is said about the victims, plenty of people think that is harsh, whether we know them or not. So basically I think the sympathies are balanced with the attacks, but the attacks for some reason seem more genuine and stick in our minds.
I believe this theory is born out by the flipside. When the victims are personally known by people on the board it seems like, if anything, the tendency is more toward true sympathies rather than blame laying. When the victim is known it seems like the naysayers generally hold their tongues.
Thus for the same reason that sympathies for an anonymous victim seem hollow, casting blame on anonymous victims doesn't seem as ugly. This allows people to act the cad and call dead folks idiots.