To collectively get folks to do things for the greater good, laws and regulations are required. Pretty salient feature of society.
I think the nexus of where both libertarian and Communist thought fails, is a belief that human beings will voluntarily collectively act against their own interests for the greater good in a long term reliable way. One is an overestimation of the virtue of markets, the other a similar misjudgment of human propensity to abandon individual interest. Both are important, just not sacrosanct.
When it comes to social safety nets, I can idealize a sweet spot between the two where conversation is hard and interesting, but both fringes are a sort of utopia - the likely efficacy of each happens to be fictional.
Again, none of which means we shouldn’t have conversations about fixing that which is broken or is on its way to be broken.