You can hold that view, but if you didn't support people with children who couldn't afford them, what'd be the consequence? Some might not have kids, but loads still would and those kids would be in worse poverty than if you helped.
And that's one of the bizarre things about our society. Want to drive a car, you need to take two tests. Want to own a firearm, you need to jump through hoops. Want to get a job, you need to prove yourself via exams/interviews etc. Want to have a kid whose life you can potentially completely destroy through incompetence - go right ahead!