The fact that a guy like Trump was ever elected in the first place would imply it is not working fine. Half of the electorate supports his anti-immigration policies. In an alternate universe where immigration laws were properly enforced he may never have been elected.

Further, just because something has never been an issue in the past doesn’t mean it won’t be in the future. The US is an outlier in being the only large and wealthy country that does this. Not many people are flying to Pakistan to give birth to secure Pakistani citizenship for their children.