Are Tony Blair and George Bush 'war criminals'?

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I don't think it's a useful term, and that's coming from someone who has used it in the past. The problem is that the term itself is inherently undefinable by most people using it (seriously, just ask an antiwar protester what they mean when they call Bush or Blair 'war criminals' and make sure you bring your popcorn with you...) and on a personal point, I would reject that formulation because it reinforces the silly idea that international law is worth the paper that its written on and/or will ever be applied to leaders of the countries that set it up for their own advantage.

Bush and Blair are bourgeois politicians, and on that account, they are guilty as charged for acting as commanders-in-chief of imperialist polities. You don't have to appeal to some pretend notion of universal, international law (which doesn't exist in reality) to note that and condemn them as such.