There are lots of issues here in no particular order:
1. Kitimat or Prince Rupert route
2. Tanker traffic on west coast
3. Bitumen at all
4. Fossil fuels generally and the atmosphere
5. Long term Infrastructure investment in a declining industry
6. Pandering to Alberta's divisive strategy
7. Indigenous interests
8. Shifting trade from from US
9. Who pays the financial costs
10. Long Canadian history of pipeline politics
11. Character limits on fediverse posts