As the Geneva Conventions is an agreement between governments of countries, and Afghanistan isn't a signatory, neither they nor we have to adhere to it when dealing with one another.   Even if it were, cremation isn't desecration. I'm pretty sure that playing rock music and calling the enemy 'sissy boys' isn't included in the Geneva Conventions. Isn't this similar to Monty Python's "I wave my private parts in your general direction" tactics?