not that vader. If a sum from their paycheck went to social security, then they are entitled to it. To not do so, or to not RETURN that money to those people would be theft.
Read the article too. Its not for LEGAL IMMIGRANTS, its for people who LEGALLY work in the US but live in Mexico, aka, they cross the border to work in the US every day.
Also, im willing to bet most of those people could get RESIDENCE easier than the average mexican because they have these special work visas.