Because the people from those other countries have come here legally to work and pay taxes into SS. We are talking about granting illegals the same rights as those of us who have paid into SS and look forward to collecting on our 'investment'. Also, adding millions more to the eligibility rolls of SS will certainly sink it.
Another question: Who gets the benefits if three different people are using someone else's SS#? The original owner, are the benefits split four ways, three ways or are all entitled to full benefits? You can see where lawyer will take this can't you?
There are some who say this is why Congress has been tardy in addressing immigration reform. Every SS dollar contributed by the illegals pushes out the date of SS insolvency. If and when Congress passes immigration reform, those illegal dollars disappear.