You would have to be familiar with the 2016 libertarian party presidential debate and the obsession with toast-related licenses in order to truly know for sure.
It certainly harms citizens that want to travel to the other country. It harms businesses with customers in the other country. It harms citizens who love someone in the other country. It harms the livelihood of citizens who trade with those on the other side of the border.
When reporters and students stop being beheaded in those countries, maybe we open the borders to them.
It's called sanctions.
We do it to Iran too.
No one is advocating for Canadian borders to be closed out they're not wholesale murdering students who disagree with them and burying the bodies in unmarked graves, at least in modern times.