A good example, would be when the Texas Army shot Mexican soldiers while they were swimming the San Jacinto River. Or, when Santa Anna showed no quarter at the Alamo. Or, the atrocities committed by the British Army during the Rev-War. Or, how the Federal Army's crop burning caused 250,000 Southern civilians to starve to death during the Civil War. Vicksburg, Port Hudson, Petersburg, the list goes on.
Were the United States military to act in the same manner, today, the hand wringers would be off the chain, wanting to persecute anyone wearing the uniform.
That further enhances the idiocy of persecuting these guys for pissing on some dead bodies.