Eric, do you really think we could keep out people like this who are determined to come in? Anyone who wants in from Canada can just walk across in the wilderness, and we don't have the resources to stop it. You could deploy the entire US military and still not secure it. Its just that big.
Tightening up on immigration is just like tightening up on guns.... those who will be affected are the law abiding, the criminals will still get in, just as they still get guns where gun control is the law.
Walk over in the wilderness, stow away on a ship, come ashore in a sub (some rouge nations have that capability), get fake passports(even US ones). So many ways to do it, you can't stop em from coming in if they want to.
But it makes a good excuse for those who have an anti-immigrant agenda anyway. And using this to further that is just as sick as using school shootings to push an anti-gun agenda.