Amazon can legally do it.
Whether they should is a different question.
I used to work as a bookseller.
We stopped selling porn.
Would you have made us sell it anyway?
Maybe certain companies should be broken up like Ma Bell.
While government getting involved in most things is a bad idea, we are entering a time of rising monopolistic powers.
I’m not completely sure what is the best way.
I do know America is currently heading in a very bad direction.
Would you have made us sell it anyway?"
No. I think we have to defend the rights of private companies to sell what they think their market wants.
Is ANYONE suffering from lack of porn books? It's more prevalent and available than EVER.
If there is demand, a market channel will appear. Even if government, or Amazon, bans it.