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is there any reason that this is framed as an immigration issue rather than just a driving issue?

Xenophobia.
I don’t necessarily disagree but is there any reason that this is framed as an immigration issue rather than just a driving issue? I grew up in an area with snow too and I guarantee you ppl can be native to the area and still shit drivers. 
If you think requirements for driving should place a larger emphasis on winter driving, then just say that and it covers residents and immigrants.