I wouldn't call myself a conservative. Obviously as private companies, Amazon and eBay are able to make rules about what they allow to be sold. I do think it creates a real chilling effect when both Amazon and eBay refuse to sell these books, since they are essentially an oligopoly in book sales.
It's actually the libraries pulling them from the shelves that seems so bizarre to me. I could understand them moving them from the children's section to somewhere else, but to remove them from circulation entirely, and then presumably put a bunch of other books out on the table for banned books week is just strange.
Public libraries have historically been a big institutional force for the rights of free speech and free thought, fighting in court to be able to loan out (and keep secret the names of borrowers) very controversial books. I honestly cannot understand sacrificing those principles and all of that history over Dr. Seuss.