If there were a successful society that operated on socialism today, surely you would have mentioned it. Don't try to cite the Scandinavian countries. They are not Socialist. You could mention North Korea or Cuba but I doubt either has an illegal immigrant problem
Socialism was part of America's founding. Read your history. The Mayflower colony started out with everyone sharing everything equally and they practically starved because once people realize that their "share" has nothing to do with their "contribution", they do as little as possible. So, after a year or two, the land was divvied up and everyone was on their own and the colony thrived.
Ayn Rand put it succinctly. "From each according to their ability. To each according to their need". Sounds to me like "until your run out of other people's money" quote.
@moke123 You are still evading the question about how to not deport the 2-year old with the parents. I guess you really can't answer it.