Well this has to be at the top of stupid liberal logic. They contribute to social security by COMMITTING A CRIME and as such they should be rewarded for it. Makes perfect sense.
We'll put that up there with burglars entering a home and the suing the homeowner when they get hurt.

The two things are not even comparable. The silent underclass buoys the economy. In the last twenty years, budget projections have always included the money illegals would not be taking out of the system. Remember how Bush's immigration reform policies were unappealing to both the right and the left? Realistically, no White House, conservative or liberal, would want to get any immigration refrom pushed through.With the status quo, illegals are actually profitable for the country. In any reform scenario, the country plunges into a budget crisis.
That being said, beyond being ethical, it is smart policy and in the country's best interest to keep them healthy and turn a blind eye.