So I'm not sure 100% where I stand morally on the "if not us then someone else" argument as whole but I'm pretty sure it's better to just not let that person/entity be you (in this case Amazon), and figuring it out from there.

Even if the world is lacking in your brand of ethics/morals doesn't mean you need to stoop to the same level as someone who doesn't hold the same brand of ethics/morals.