I find this kind of appeal to "reason" questionable. While I am thankful that my parents took care of me while I was dependent, did I ask to be born into this world? I don't view my parents as an inconvenience to my life ambitions but it's a lot more reasonable to view them as such compared to parents that feel that their children (who are there because of their decisions in one way or another) are an inconvenience.

Tough luck I guess? I didn't sign up for this. I love my parents, they made their decisions, I've made mine. I'm not wrecking the future I've planned for and built with my wife because they've failed to adequately plan for their care.

My parents are functioning adults. They've had decades to figure out what they want to do as they age. They haven't been hit with unexpected ruin or financial woes or other troubles. Their lack of preparedness is strictly on them.

I don't think parents should having children expecting those children to grow up and take care of them in their old age. There's sooo much that can happen (what if you have a bad relationship, what if one falls into drug dependence? etc) that you should have a solid plan for yourself.

They raised him to be like that.

Children lack agency, and can’t be expected to plan ahead like that.

Having a kid is a choice they made. You don't choose to be born.