The only reason I called the police on the guy who robbed me at gunpoint was because I was concerned that he might also steal from someone who couldn't stand to lose their money AND because he was using lethal force to steal money.
I didn't really enjoy the few weeks of stress that I got from being mugged. But I otherwise didn't hold it against him. He was much more polite than a person with a gun has to be. And I could afford gas at $4 a gallon (as it was at the time) where he couldn't (credit cards showed him immediately going an filling up at a gas station).
If a rich guy had mugged me, I think I would have been a bit more upset about the experience.
But I guess the point I was making was that if stealing or taking advantage or someones misfortune is morally wrong in one context, then I don't quite see a principled way out of it, other than layering an assumption-ridden argument about Amazon being bad and therefore deserving of this. As is typical in most corporate environments some engineer/pm/sales dude is probably going to end up being the fall guy. IMHO the only way to "stick it" to Amazon and come out on the moral high-ground is to stop using them. There is a time for civil disobedience, but it is possible for most consumers to avoid shopping with them.
This doesn't change the post hoc moral reasoning, but it night have incurred less impact on you.
On the other hand, Amazon has an unbelievable amount of power. And I think things would be a lot better if we as a society applied the spider-man rule. With great power. If a small mom and pop makes this sort of mistake, then I'm all for them correcting it and not giving away $13K equipment for $100. Maybe they were doing it maliciously, but because of how small they are the scope of their malice can only affect a small number of people. On the other hand, Amazon has the power of a first world nation state. If they make a mistake, innocently or maliciously, then the scope can affect a lot of people. Yeah, you messed up Amazon. Don't export the cost of failure onto people without the power to fight it. Pay for it yourself with your considerable resources and then resolve the issue with your considerable resources such that you don't make the mistake again.
EDIT: Mom and pop might not have the resources to cover their mistake AND they might not have the resources to reasonably prevent it from happening again. And because of their lack of resources they are also on a level playing field with their customers. So if their customers feel that what was done to them was wrong, then they can reasonably challenge mom and pop in court. On the other hand, if Amazon decides that their customers are going to lose in court, then their customers are going to lose in court.