No, we want to attract people who follow the law.  You will have a hard time trying to enter Canada as a tourist if you have a criminal record or even a DUI.

And how do you know her entry two decades ago didn't delay entry for any alien gaining citizenship?  Are the millions here in the US illegally not taxing the US support system?  Does that not limit the capacity of how many can hence legally come to US?

So if someone steals from a grocery store, are you going to argue it's not making anyone else hungry too, so it's okay?