Another reason it is wise to have multiple sources selling on Amazon is that Amazon plays games with the sellers over whether or not they will allow a product to be added to your inventory. And if anyone complains they may block that seller's page. I had a very difficult time getting Voice of the Trumpet listed because of the subject matter. And other's have had their accounts closed with no explanation.
Of course, it's even safer to have your own website, running an installed copy of some e-commerce software. Then you're in control.
You have even more security if you self-host your website on your own web server (as I do with CathInfo and ChantCd.com)
That's pretty thick armor. I could sell "Mein Kampf" if I wanted to (note: I don't want to). Everyone depends on a merchant account to run credit cards, so that's one point of vulnerability.
But even then, I could always accept cash/check, bitcoin or similar means of payment.
I depend on electricity and Internet service -- but both of those are utilities, and they couldn't shut those off to my household without some kind of court order. A "twitter storm" stoked by SJWs isn't going to do it.
That's basically my only vulnerability -- the same one everyone has -- the courts. That's a pretty high cost of entry to be able to attack me. Much higher than opening a new e-mail, and sending a quick e-mail to abuse@hostgator.com, abuse@amazon.com, abuse@proboards.com, etc. -- which literally anyone with Internet access and a spare minute could do.