I advise that you just don't give a fuck if the order is coming through Amazon or not. Who's to say whether they're more evil than some other company that might fulfill your order. The thing you're buying was probably made with exploitative labour practices from unethically sourced materials anyway. Simply shipping it to you is probably dependent on a global logistics network of fossil fuels and colonialism.
Just don't think about it. There's no way to buy things in this world and "do good" at the same time.