It's very dangerous to moralize, unless you have a vocal group supporting you and no vocal group opposing you.
But parents take care of us, in general, for the first 18 years or so. They wiped our butts, put up with being pissed on, burped up and thrown up on; they put up with things broken and trashed, rebellion for the sake of rebellion, and took a big economic hit. Then, when their kids grow up, "So long, and thanks for all the fish" is about all they get from many kids, along with maybe a birthday card and dinner every year. That's fine, if the parents had kids entirely for themselves, and 'generativity' in Erikson's hierarchy is just another term for 'self-absorption'.
http://www.coe.uga.edu/~cmims/Erikson/pages/stage7.htmlMany kids rant about collective responsibility for taking care of their parents, which comes off as very, very self serving: their parents had the 'collective' responsibility for raising them, by and large, and only had their responsibility taken over by society if the parents were derelict. Most kids resent when their parents do that to them--they feel abandoned, abused. But to do it to parents is, well, good.
But in today's society, it's hard for kids to take care of their parents, even if they wanted to. We're too mobile, we don't have enough kids. And the culture's now wrong for it. My brother and his wife took care of his grandmother for years, and it really created problems. His grandmother's other grandkids wanted her to transfer her assets to them, and when she did then they wanted to put her in a nursing home. Fortunately, she was able to take her of her own physical needs until a few months before she died--she had Alzheimers, but wasn't bedridden.
The church I was in for a while had 'kids' trying to take care of their elderly parents. The 'kids' were in their 50s. It was usually a daughter taking care of her mother, for assorted reasons. When the mother couldn't attend to her own needs, the daughter's physical and emotional health suffered--moving her around, shifting her, bathing her took a real toll. Usually it was one daughter, since the offspring had scattered around the country. And since we're living longer, sometimes with limited quality of life, these 'kids' would take care of a parent for a decade or more. Very nasty. My parents both want to be active until the last day and then die in their sleep. They may well pull it off. But my childless aunt had a stroke and is partly paralyzed....
Usually at some point the "kid's kids" would confront their church-going parents, saying they weren't being selfish enough--after all, *they* weren't going to do that for *their* parents, their parents were society's responsibility--that the middle generation had to take care of themselves. Sometimes the youngest generation resented the lack of free daycare, grandma had to wipe her own mother's tail, not her grandkids'. Sometimes they realized their parents were running through assets taking care of the elderly. But their parents were always making them feel bad. (At which point the middle generation realized they didn't pass what altruistic values they had down to their kids, and they'd wind up raising kids to adulthood and seeing their own parents into the grave and then be left by their own kids to die in a nursing home, minimally cared for by 'socially responsible' minimum-wage earners doing their kids' duty, "caringly" and "lovingly" entrusted to complete strangers.)
There are, of course, exceptions.