This is tough because I don't want to straw man them, but I'm not sure I've ever heard a hardcore libertarian really argue that their policies would be better for the whole of society.

Generally it seems like they think that minimal government leads to better results in a social Darwinism or "get rid of the parasites" sense.

I've also never really seen them seriously recon with the question of what you do with people who cannot compete, and at some point I feel like that crosses the line into intellectual negligence.

Again, I don't want to try to demonize the other side and I really wish I could think of a good example, but I really cannot.