You obsess about closing the border, but doing so earlier would not have stopped Canadian snowbirds from coming home and visiting elderly relatives without isolating first, nor health care staff returning from holidays and going straight back to work in Long Term Care without isolating, nor PSW's forced to work in 2-3 LTC homes to make a living wage.
Your xenophobia has you pointing your finger in the wrong direction: The virus came home with Canadians. The problem was not borders but lack of isolation of returning Canadians, and lack of proper staffing conditions in LTC.