Absolutely, 'pay tax for everything I received' is a much better philosophy.
"I think those childless people who are earning between £43k & £150k would argue that they contribute a lot of money already. They'd be paying between £11k-£59k EACH. And currently they get no benefits at all."
But HRT payers with children are also paying that, and as a society, we need this group of people to have children, because statistically speaking, these are the children who will keep the economy going into the future.
The last thing we should do is price this group of people out of the parenting market, so that the only people who can afford to have children are people on benefits and the uber-rich.
Given that if you have a family of 6 to support (as our's is), then your salary needs to go further, I think it is perfectly reasonable to have a benefit, or even better, a tax allowance, to recognise your increased costs. As a parent your disposable income is very much less, and the Child Benefit goes some small way toward redressing this.