My own views sort of shifted but not in the same way. I was 17 when the War in Iraq started. My view at the time was of very skeptical support; having lived through the 90s I had an engrained view that the world needed to use force to help prevent ethnic cleansing. We didn't intervene early enough or strongly enough in Rwanda, and that particularly bothered me. After the beginning of the war, I pretty quickly became anti-war when it became increasingly clear to me that the pretexts (WMD, Saddam is going to attack the Kurds again) were not justified. I would say by about mid-2004 I was pretty comfortably anti-war. When Bush called for the "surge" I was definitely all the way against the War in Iraq.

Today if you asked me what I thought about it, I would say Iraq was the worst and least justified misadventure America embarked on that had some ostensible humanitarian pretext. So I guess my position would be that I still wish we could prevent genocide, but I'm increasingly convinced it's difficult to tell justified reason from pretext in time to intervene, either as a country or as as individuals trying to hold our leaders to account. I guess I would say is that Bush struck me as a person who embodied the way in which misguided motivations could lead to terrible results.

But with Trump, there was no misgivings. He had terrible motivations. His view on the use of force was two fold: (1) I don't give a fuck about any other country, why should I? (2) We're number one and I'll blow you up with my bombs.

I think it's tempting for many to look at his isolationism as a repudiation of Clinton-Bush-Obama era, but it was a repudiation only of the duty to care about others. His frequent verbal escalations and tactical willingness to disregard collateral damage (in Iraq/Syria), as well as his weird outbursts like threatening to use tactical nuclear weapons, and his constant constant constant remarks expressing praise and respect for violent autocrats justified by admiration of their will to power make it clear that he was just as willing to use force, just as militaristic, just for somehow even worse reasons. I am very thankfully that none of the bubbling tensions ever came to a true head under him.