http://www.sciencedaily.com/releases/2007/07/070703172054.htm So Alzheimer's is a prion disease, apparently. This is a big jump, partly because the biochemistry of prion diseases has seen a lot of work since the Mad Cow outbreak - much of that stuff applies.
Uhm nope. Sorry, but you got it wrong. Normally folded prions apparently prevent Alzheimer plaque building.
And the abnormal ones fail to do that, the resulting haywire biochemistry leading to destruction of the brain. What's wrong?
That one is wrong. Alzheimer is not caused by prions. They may only have a beneficial effect with regards to Alzheimer prevention. Think of it that way. Antioxidants may have beneficial effect in case of some immune diseases. It would be wrong to assume that theses diseases are caused by lack of antioxidants. Also the abnormal prions may lead to Creutzfeldt-Jacob and not to Alzheimer.