People don't want to get married or be committed because this way they can go hook up anytime they're in heat.
They don't want children because it interferes with their pursuit of satisfying themselves.
There is little interest in self-sacrifice. It is all hedonism all the time. It's all about me!
Don't publicly whine when you're all alone at 55 with your shacked-up temporary “partner” and now facing your own mortality.
My point is, don't paint everyone who would rather not have children with the same broad brush. I'm proud and supportive of those who do have children, but it's not right to condemn those who for whatever reason can't or won't have children.