I have no probelem with people leaving 1* reviews without reading the book, just like I have no problem with Amazon removing those reviews (and only those reviews). Yes they are annoying, but they are also one of the few visible ways to protest. While "not buying the book" will probably be effective in the long term, an indivudial non-purchase isn't going to be noticed by anyone.

A similar situation to this frequently arises when big games are released on Steam. Amazon then gets flooded by 1* reviews from people who can't get Steam to work properly on release day or something.

I also find the opposite very annoying: when fans rate something as 5* before it's even released.