The tired argument of "Who will take care of you when you are older" is pure bs as many people put their 'dear parents' out to pasture in a nursing homes anyway.
As far as social security goes, how about that personal responsibility that is always paraded about around FR? Save your own damn money instead of wringing your hands and screaming "breed so i can have a pleasant retirement!" at younger generations.
Many people could not imagine life without kids. For others, they just do not want them. Period.
And as far as treating dogs like kids, plenty of families with kids do treat the dogs like other kids as well.
And, unfortunately, plenty of parents treat their kids like dogs.
My sister-in-law, for example, who, in a just world, would have her tubes tied, by force if necessary.
Actually, I made no judgments in any of my posts about others' choices, other than a joking reference to those who treat their dogs as their children.
I've mainly stated my viewpoint, which is that my children are my life, my most important accomplishment, and my legacy.
I wouldn't trade 'em for anything.
By the way, given the right circumstances, I'd have more kids, too; even at my advanced age. ;-)