>
to consider society as a mostly-altruistic, benevolent mass of humanityThere is no mass of humanity in that way, just like "HN believes..." or "Reddit thinks..." is mostly impossible to say. Some folks of that generation did/do act in mostly-altruistic, benevolent ways, and some of them did/do not. The generational argument is a very clever red herring that shifts blame from a broken system to the previous generation -- print this comment out and put it somewhere safe; your future children will be blaming your generation, too.
> "how the hell did these people end up working minimum wage, 11pm shifts at the grocery store at age 58?"
Lots of times, sheer boredom. Folks like us might do freelance coding or something in our old age, but there's not a good market for freelance people managers (which a great deal of those 58-year-old bag boys probably were -- why not ask them next time?) Also, big grocery stores are typically union so it's not actually a terrible career for the kind of work it is. Your generation has a different idea of what a "good job" is, so that's probably informing a bit of your reaction too.
> I find that many in the older generation are simply trying to make ends meet in an environment of scarcity
Most people are simply trying to make ends meet. Some saved more, some saved less, some earned more, some earned less, but in the US if you worked and paid taxes, you'll get the bare minimum (social security + medicare) and won't ever starve or go cold. If your desire for retirement is more than "won't starve", start saving today and always live below your means.
> with the youth subsequently becoming disillusioned because the system seems to be set up against them.
Every generation back to the ancient Greeks felt that way. There's basically always been a counterculture movement based on youthful disillusionment, some more successful (hippies of the 60s) and some less (#occupywallst). But it's not anything new. This should tell you something important: the system is the problem, and the system is adverse to change. A lot of those hippies turned into middle managers.
> But you would think "they" (the nameless, faceless, despised rich) would find it in their interests to give back to society
They absolutely do. The top 1% of earners pay 50% of federal taxes. Those social programs I mentioned above that will keep you eating, clothed and warm even if you don't have a penny to your name? Thank the taxpayers, of whom top earners comprise disproportionately. Almost all charitable foundations are made possible by the rich. Did you take any grants, subsidized loans or scholarships? If so, thank taxpayers (mostly top earners) and private donators (again, mostly top earners).
What's weird is that you understand the effect ("greed, sloth, misplaced violence, weak guidance, and weaker morals") but totally misunderstand the cause. Yours is the first generation of "everyone's special" come to adulthood. Instead of looking at the rich person and saying "wow, I want that, how can I get that for myself?" (and then doing it or at least trying), they'll say "wow, I want that, he has it, f* that guy". It's worse than greed, it's covetousness - wanting something so much you'd take it from someone else. That will be America's undoing.