The reason the US and Canadian governments are doing this is to stop that $10k car from destroying the auto motive industry in North America resulting in layoffs that make the recent tech layoffs look like peanuts.
I agree we need cheaper EVs in North America, I want one too... There's an Ars Technica article where Ford basically goes "we thought everyone wanted expensive trucks ... we made those electric ... we realize we missed the mark, we're going to work on smaller, cheaper, EVs." So, they are coming hopefully within the next couple of years.
I'm not sure how important manufacturing still is to the Canadian economy, but for the US economy ... trying to protect domestic production is important (and we should've done it years ago instead of letting cheap Chinese imports destroy a large amount of the factories in North America).