What other viable model is there? It's called survival of the fittest for a reason. There are finite resources on this planet and an ever-increasing global population vying for those resources. Like it or not, humans will always be competing with one another for access to those resources. As a whole, we are not an altruistic species. We can at times put others first (our children), but overall, we're the same species that walked out of the caves and when push comes to shove, we will put the interests of ourselves and our families above everyone else competing for a better quality of life. In that way, we're no different than most other species in the animal kingdom (save for ants and bees and other drone-type species).
To that end, economic models predicated on treating human populations like ants or bees are antithetical to human nature, which is why they never work. And hell, even ants and bees require all members of the colony to work, they don't have a "freeloader" class that reaps the benefits of the resources and infrastructure provided by the workers while contributing nothing.
We are the only species on earth that entertains the notion of a nanny state, where members of the population can simply opt out of competing for their own resources or working for the betterment of the colony, and instead, expect to be provided for, from cradle to grave, by allocating resources generated by the work of other members of the colony. And of course, this system has always been a miserable failure, prone to abuse and perpetuation of class disparities, among other causally-connected burdens on societal advancement as a whole.