Yeah, but export taxes are a federal responsibility. The fact that these provinces are irrelevant for the Liberals politically is those provinces' exact liability here.
Right now Alberta and Saskatchewan are not suffering at all (2% of exports affected) from Trump's tariffs.
This is by design.
He (or the "smarter" people he surrounds himself with) is attempting to drive a wedge in Canadian unity.
Danielle Smith is, btw, totally onside with playing this to her advantage to get things.
Export tax, as just as it might be in these circumstances, would be used as pretext for wholesale foreign interference and domestic disruption on a level we have never seen in this country. It would end up being a profound self-own