Calling "contextualizing a piece of literature in its broader sociopolitical context" review-bombing is pretty myopic. For example, if you decided to write a book on how awesome the Nazis were, you would rightfully raise some eyebrows. But in any case, the problem with crowd-sourced reviews is that this is a "live by the sword, die by the sword" kind of game. It's great when a bunch of lemmings love your book, cause it to catapult in ratings, and go viral. But, some are now discovering that it can go both ways: the masses being "negatively viral" or purposefully trolling, or brigading.
You can't have your cake and eat it, too. This is the main reason I've never seriously used Goodreads as a source for pointed literary criticism. Like most social media, it's a bunch of self-important folks trying to be more self-important.