I think we really only have 2 major beefs with Mexico
(1) They’re actively encouraging their citizens to become unauthorized residents of the USA
(2) Street drug and arms trafficking.
That’s why the Wall. Good fences make good neighbors. Canada is respectful enough towards the USA not to need a Wall.
But still. The USA is a temptation that Mexico has a hard time resisting. It takes two to tango here, meaning in half the nod-wink that is transpiring on the US side. How angry are you with people of both US parties who acquiesced in this?
Mexico can be a friend again once it is a good neighbor.
Canada has a very large, proportionally speaking, South Asian (read Pakistani and Bengali Muslim) population. We may not need a wall but it’s prudent to keep a close eye on that border too.
When was Mexico ever a friend or good neighbor to the US?