And you think it’s just of US to sell weapons to a authoritarian murderous regime like SA? Previously Saddam in Iraq? And also the Afghan fundamentalists during Russian and Afghanistan war?
Eventually US went to war with both Iraq and Afghanistan with the same leadership they supported earlier.
The Shia militias your talking about is no better nor worse than the kind of people both US and SA and other gulf countries have supported in the region. You think ISIS could have existed without certain external help in the ME?
The question is not if Iran is bad they clearly are, but they are not worse than the rest of the regional powers also not worse compared to US given it’s track record in both supporting totalitarian leaders and fundamentalists.