What I recall, from the time of the accident, is that a Professor of Civil Engineering had designed the structure, prepared plans, produced a manual (insert MensaTom binder joke here) and had supervised the previous couple of years' construction. The design included using double-length logs in each layer (except the top, of course) which essentially tied the layers together to prevent exactly the slippage that happened. However, he had left aggy (for Colorado State, I think it was) and was not there for the Fatal Fire. I'm not sure about his successor in the task, but whether it was an active faculty member or not, the critical element - the longer logs that tied the layers together were apparently not used.
The issue is not that the structure was a shitty design - I think it is a perfectly good design, in fact. The issue is that they did not follow the design, and that is - or seems to me to be - a classic case of negligence on the part of the school itself.
Heads should have rolled: they didn't.
Fuck aggy, and fuck the aggys that deflected the punishment.