If American troops are shooting up minivans full of civilians, they should be investigated and tried by the US legal system, if the US legal system ignores this , the UK should pull out of Iraq, they are going to anyway, the last helicopter out of the Green Zone will be American just like Vietnam.

__________________
“ The subjects of every state ought to contribute towards the support of the government, as nearly as possible, in proportion to their respective abilities; that is, in proportion to the revenue which they respectively enjoy under the protection of the state.”

Adam Smith , The Wealth of Nations 1776

"We have always known that heedless self-interest was bad morals; we know now that it is bad economics"
FDR's second Inaugural Address