> Just because I think that no country should meddle in another's affair

A random person wanting to cross the border to attend a protest is not a "country meddling in another's affairs". It's an individual wanting to join a protest.

Let's not resort to hyperbole here.

If the Canadian government was telling its citizens to go cross into the US and join protests, then yes, that would be a country meddling in another's affairs. That's not what happened.