Exactly. It shows Amazon is making a bad precedent. If Amazon removes books deemed to be unscientific, does this mean books have not been removed are deemed to be scientific? Should Amazon has a science department to validate all medical books?
An allegory: I'm currently using Craigslist to look for an apartment in San Francisco. I frequently encounter posts which are obviously scammy. I disregard them because I know that Craigslist can't possibly have the resources to police all its listings.
That said, I still appreciate it when they take the time to remove a scammy post. And I don't by any stretch of the imagination think that the listings I find on Craigslist have been endorsed by Craigslist.
Spot-checking and removing garbage posts from Craigslist (or books from Amazon) may be a never-ending game of Whack-A-Mole, but it's still better than letting those platforms turn into the Wild West.