If Rubio were promoting legislation to merely accelerate the applications of the 4 million overseas who are waiting (decades in some cases) to become LEGAL citizens, yeah I would applaud it. But he isn't. Instead he is promoting legislation to IGNORE those people and instead "legalize" 20+ million people who broke our laws to get and stay here, 70% of whom will never even apply for citizenship because they just want to mooch off our economy or welfare system and send most of what they mooch back home.
I have read reports of studies which showed that Latino second and third generations show even more slippage into welfare and “entitlement” lifestyle than the first generation, because of the school low grades and drop-out rates.