You might be right now in your judgement of what Americans are willing to die for.

However, I'm old enough to recall when America was convinced by Rumsfeld et. al. to send US soldiers in harms way -- over 4000 of them died in Iraq -- for some obscenely lucrative oil contracts.

That qualifies as "die en masse", and it was over some really flimsy pretext, which was later proved to be completely false.