Guests or gate crashers by Thomas Sowell

If you mean stopping every single illegal immigrant from getting in or expelling every single illegal immigrant who is already here, that may well be true. But does the fact that we cannot prevent every single murder cause us to stop enforcing the laws against murder?

Since existing immigration laws are not being enforced, how can anyone say that it would not do any good to try? People who get caught illegally crossing the border into the United States pay no penalty whatever. They are sent back home and can try again.