I'm willing to bet half those BC stats are actually Albertans driving into the mountains. Significantly more westbound than eastbound fatalities in the Rockies. If you fall asleep at the wheel in Alberta you wake up in the middle of a corn field. If you fall asleep at the wheel in BC you don't wake up.
While I don’t disagree there’s a high likelihood it’s Albertans, very few Albertans drive west and not back east again, so your anecdotal data doesn’t represent your argument.