I think another reason people are pissed (and legitimately so) is that we are paying more (4th highest in Canada) for a product distributed in our own back yards. Yes, provincial carbon tax has to do with this as well, but reasons or excuses don't change the fact that its comical a predominant oil producing province is paying a lions share.
If we want to go a little further we can do exchange included calculators for US vs. CA per unit cost. Currently, at the cheapest (in SC), its $2.51 USD per gallon, or $3.29 CAD per gallon, or .87c/L. At highest (Hawaii FWIW), its $4.86 CAD per gallon, or $1.28/L so we are paying more than an island in the middle of the pacific, known for its exhorbitant goods prices due to *shocker* location.
Yes, taxation is a factor of that, but regardless of who we are getting gouged by, we are getting gouged.
I feel terrible for the single moms who need a car for employment, or fixed income individuals, where they don't have the flexibility like most of us do to shrug it off.