"If it doesn't rank next to those other reasons for immigration that all exceed the friction, I would suggest that people stop defending the US system by saying

"If it doesn't rank next to those other reasons for immigration that all exceed the friction, I would suggest that people stop defending the US system by saying it's better than Canada's system. It isn't better enough." That's fine. I assume the reverse, asserting that the Canadian (and European, and ...) systems are better is also a no-go, given rates of immigration there from the US? I just don't think anyone's going to move anywhere for health care systems unless they're already sick and they're going for medical tourism purposes. Use of the health care system is a nebulous future possibility, whereas a job or the weather or the cultural environment is an everyday reality. Immigration rates aren't going to tell us much about any health care system. (edit: specifying the final object)