Oscar and Grundgetta, as grouches, are annoyed to see Baby Bear and Curly Bear playing peacefully. They attempt to sow discord, getting very excited when Curly Bear fails to grasp the basics of drawing and throws crayons and paper around. The Grouches hope that Baby Bear will flip out, but instead, to the grouches' extreme irritation, Baby Bear sings a fucking song about sharing.
By the end of the day, none of the grouches' trolling has been effective. Baby Bear and Curly Bear learned lessons about sharing, and nobody had a fight. The grouches announce that they feel rotten.
But wait! Grouches LOVE feeling rotten! So they're HAPPY!
I relate this important episode from literature not to demonstrate any point, but merely to illustrate a concept I use frequently: Grouch Logic. Grouch Logic refers to arguments that seem comically nonsensical, not because of flaws in reasoning as such, but because highly unusual preferences and values drive the logic - often preferences in direct opposition to the "common sense" preferences ostensibly shared by the entire reference group.
Philanthropic antinatalists like me are a special group of grouches who start from an eccentric assignment of value ("it's a great harm to be born"). This alone is enough to make most of our conclusions sound comical, no matter how sound our reasoning.