The complaint is not that Amazon are intentionally blocking certain controversial material, but that their policies are fundamentally flawed and easily-abused.
I don't think it's paranoia, so much as it is someone lamenting a loss and looking for someone or something to blame. He's wants this to be a big deal, even if it isn't..
I'd say it's more about too big a sense of self-importance than anything else.
This also isn't the first time that one of Amazon's policies has been abused... http://blog.seattlepi.com/amazon/2009/04/12/amazon-under-fir...