But there is no fraud. As has been stated elsewhere in this thread, the drug claims to remove plaque, not to treat Alzheimers. I personally don't have the hubris to think I should stand in the way of someone willing to try the drug on their loved one who is suffering from Alzheimers.
This is an incredibly expensive treatment meant for incredibly desperate people. If you were in a situation where a parent had alzheimers it would be hard not to feel guilty if you didn't try it, no matter the price.
To approve the drug despite the lack of efficacy is unethical, especially considering there are potentially severe side effects like brain swelling.