If your response to hearing that someone has a lot of kids is “wow, ever heard of birth control?” maybe you should grow up and learn to mind your own business instead of trying to take other people’s happiness away from them. As unimaginable as it may seem to you that parents actually love and enjoy their kids, the greatest joy in life for a lot of people is being a mom or dad.
Who are you to say that’s not a worthy calling or that they aren’t doing it right?