Earlier quoted context omitted.
Let's be clear here. Weev didn't censor Amazon listings. If what Weev claims is true, the most you can say is that he helped trick Amazon into choosing, via automated means, to censor those titles. But ultimately, it was Amazon who took the action to remove the listings. (Unnecessary disclaimer: I'm a huge fan of Amazon, and hardly a week goes by that I don't buy something or other from them.)
Your logic simply doesn't hold. If some guy repaints highway signs to cause a car crash, then, if anyone dies, he should be up for murder, not the driver. The guilty party is the vandal in both cases, not the driver or the computer operator.
But he didn't repaint the signs. At worst, he convinced a few other people to call up the DOT and say "That stop sign shouldn't be there, please change it to a 55 MPH speed limit sign." If the DOT then goes and changes the signs without appropriately verifying, then it's on them...
I realize as programmers that we might think Weev's (purported) actions are directly responsible for the de-listing, but they aren't. It's ultimately Amazon's code that did the de-listing.