Earlier quoted context omitted.
That is assuming Iran holds itself to the Geneva conventions, which ... seems like an extremely risky bet to make.
The US doesn't hold itself to the conventions, why should the country it started a war of aggression with?
US exceptionalism is a prominent feature of every republican and democratic president since decades.
It's sad, because if US did, and led by example, it could've pulled serious weight internationally on plenty of matters.
Instead it can only do so by economic or military leverage, which, at the end of the day is not enough of a leverage to avoid confrontation.