Not sure why you're getting down voted. The OP wasn't explicitly about the US but Bernie Sanders got 13M votes in the 2016 primary and he is very clearly in support of taxing the wealthy. That sure is a lot of "insane" people isn't it?
What is unreasonable is assuming that taxing wealthy individuals is, on its own, enough to solve all these other social problems. There just aren't enough billionaires for that to work.
So it's not a "brain disease", it's a disease of the immune system... In the brain. And it's not that the beta amyloid plaques are bad! They are good actually, except that in this case they are attacking brain cells and that is bad. So the prevailing wisdom that we should focus on the plaques is actually correct, right? The theory is interesting, but this article is very badly written.