The biggest threat from Canada is they will let anyone into their country and from there the sneak into the US.
You are joking, right? For the past 40 years, Canadian Immigration has been vigilant about just this practice, with people thinking they will come into Canada and then sneak into the US. Because, if the US catches them or otherwise refuses them, Canada is stuck with them. An old friend was Canadian Immigration: as far back as 1985 when I first met him, Canada has required immigrants to have means of support, and if they were carrying large sums of cash, Canada would confiscate and wire it back to their originating country for them to pick up there.
Can you please cite your other facts? Bieber being deported back to Canada sounds like an SNL gag. Church groups bringing in refugees without regard to US State policy? BS. Native Americans being sent back to the reservation? More BS. How many Somalian and Etheopean people have you actually met to slate them as "the rudest and most disrespectful"?