If having my children sit next to me is important then I expect to have to pay extra for this since this is mostly how airline pricing works. In other words, it isn't perfect in all use cases, like not every seat is next to a window and I may have to pay extra for this rather than have to take my chances.

Are you saying that spawning offspring should grant you privileges that other passengers shouldn't get?

I say "Yes" to both of you.

Children should have privileges adults don't have. As they aren't full independent adults, it's fair to give them special treatment. Nobody is born an adult, so every person in society will get these benefits at some point of their lives.

At the same time, I don't see why airliners shouldn't be able to charge less for tickets that are truly "we will put you whatever we want irrespective of your needs and wants". Children who need to be by their parents shouldn't buy these tickets, the same way children shouldn't buy adult shoes.

If a passenger cannot take care of themselves for whatever reason, I think they should be allowed to sit next to whoever takes care of them without having to pay extra.

Indeed and there already is a legal concept for that called a 'dependent'. And both the caregiver and dependent already receive special consideration under various laws and regulations. Requiring airlines to seat them together is both consistent with existing concepts, and just the right thing to do.

Yes, and I would say that no other passenger would appreciate a full flight alongside an alone child.

You may have more control how that kid behaves though, rather than leaving it to the whim of its parent/s?

Are you saying you’d prefer to sit next to some rando’s kid?

I would say that.