Earlier quoted context omitted.
The flaw isn't 'wanting the diamond', the flaw is 'being aware of the horrific nature of the industry and still wanting the diamond'.
I’m sure the coffee you drink and the tshirts you wear and the phone you use are all ethically sourced eh? We’re all deluding ourselves for the sake of sanity + having nice stuff.
You can't fix the whole world with personal choices, like an eyedropper against the ocean, but you can still opt out of the worst excesses without having to compromise every modern convenience.