It's not the kids responsibility to make sure their grown adult parents have a social life. That's even more depressing.

I totally understand where people are coming from with that though -- the parents gave life and raised the kids, so shouldn't the kids repay them? The only thing is, the kids didn't (as far as we know) choose to be brought into life and have the experiences with the family they had. Maybe they were terrible or at best for some, neutral. Then, why would they feel the need to "pay back" for that?

Finally, would you rather someone hang out with you because they feel guilty obligation to do so versus happy freeness to do so? I wouldn't want someone feeling guilted into spending time with me because they "owe me one." If it was from a place of "happy freeness," then sure.