You may not be able to say that Trump's actions towards Canada specifically could be predicted in any detail but there was an absurd amount of evidence that he would be erratic, self-serving, and antagonistic towards allies in general. We still elected him. There's tons of reasons for that and many of us want to latch on to some of them in order to absolve ourselves of individual responsibility for this shitshow, but other countries don't give a fuck about any of those reasons and we should not expect them to.

If you're an American, you own this administration in the eyes of the world and that's exactly how it should be. In fact, I would argue that changing course is not possible until the vast majority of us accept that fact and let it inform our actions going forward.