Scientists are evil and just enjoy giving mice Alzheimer’s.

The problem is that these mice don’t have Alzheimer’s. They’re bred to develop the symptoms: “plaques and neurofibrillary tangles, which comprise abnormally aggregated β-amyloid peptide (Aβ) and hyperphosphorylated tau protein”

https://www.frontiersin.org/articles/10.3389/fnmol.2022.912995/full

But that may not be what causes Alzheimer’s. That might just be an effect, and treating the effect might not fix anything.

We’ve probably cured every disease in mice ten times over. But one thing about science and medicine: an animal =/= a human.