you'll find most "best of" lists of this sort include a lot of heavily ideological stuff. this is because these are the works that have the most memorable impact and actually change people's opinions. Whether you find such works valuable depends largely on where you're coming from when you read it.

for example dianetics: the kind of person who will read and recommend it is the kind of person who was already against psychology to begin with. people use popular non-fiction for confirmation bias and appeal to majority bias.