Claimed identity isn't a suicide pact and consent of the governed isn't equally geographically distributed.
AB sees, correctly, an inordinate amount of tax per capita go out for the privilege of policies intended to kneecap that region's development. The justifications for those policies (whether you agree with them or not) matter less than the fact they're being imposed from a condition of moral hazard.
Hence, the people of AB might vote to ban the people of ON/QC from imposing their laws; that's what separation is and why it happens.
Not only that, but the Feds typically use their outsized tax revenue from Alberta to “invest” in Quebec to buy votes via propping up unviable businesses, subsidies, outsized proportion of public sector jobs, and federal spending in general.
You can find many examples of specific programs where Québec gets the federal government’s money in incredible amounts. But you add all these programs together and you still come up short per person compared to Ontario. Why?
The Southern Ontario car sector.
When you consider the tiny detail of actually contributing to federal finances, in the past 20 years alone Quebec has received ~360 billion more than it contributed, whereas Ontario has received ~232 billion LESS than it contributed.
Nearly half a trillion difference between the two, and nothing to do with the auto industry whatsoever.
And all the First Nations treaties are with the Crown and predate Alberta.