In the New York Times, Tyler Cowen says we need them:
The current skepticism has deadlocked prospects for immigration reform, even though no one is particularly happy with the status quo. Against that trend, we should be looking to immigration as a creative force in our economic favor. Allowing in more immigrants, skilled and unskilled, wouldn’t just create jobs. It could increase tax revenue, help financeSocial Security, bring new home buyers and improve the business environment.
Read it closely, remember the arguments, convince your friends and family.