donald trump is a bully. and, like all bullies, he seeks out easy targets. canada is the easiest target he can find.
it's not more complicated than that.
i understand that the trudeau government's instincts are to play buddy-buddy, point to the fact that we're allies under norad and nato and hope there's a rational human being in there somewhere. this is what all canadians really want. but, for at least the next four years, this is the wrong approach.
when a bully targets you because you're easy meat, you have no choice but to stand up for yourself.
they should call his bluff and make a fool out of him, and do it as internationally as possible. humiliate him on the world stage. teach him a lesson.
that's how you deal with bullies.