Easy question. Nobody. Stop all government welfare and redistribution. Sever the dependence of unproductive citizens on the productive. Return to each citizen their natural right to freely distribute their resources. End all perverse incentives. And force each citizen to provide for themselves through the value they can offer to other freely-choosing citizens in consensual trade relationships, rather than through wielding populist political pressures to enforce coercive redistribution.
Great, so just let people die if they can't afford health insurance and get bronchitis. Let people starve if the economy tanks. Ability/desire to work does not equal production. Sometimes there is a willing worker and no job to do.
Are you aware of the purpose of society in the first place? It's the idea that as a whole, we all do better when we're looking out for each other. So far it has worked surprisingly well. This whole notion of FREE MARKET EVERYTHING, PRODUCE OR DIE needs to go back to the stink hole it came out of. People, and society as a whole, are much more than their market value.
Also, there needs to be a distinction between productive and needy. They are not mutually exclusive, and not everything in this world that's worth producing can have a price tag slapped on it.
The libertarian utopia you describe is a pathetic excuse for a society.
Easy question. Nobody. Stop all government welfare and redistribution. Sever the dependence of unproductive citizens on the productive. Return to each citizen their natural right to freely distribute their resources. End all perverse incentives. And force each citizen to provide for themselves through the value they can offer to other freely-choosing citizens in consensual trade relationships, rather than through wielding populist political pressures to enforce coercive redistribution.