Both nature and nurture matter when raising healthy, happy children who are likely to be net tax contributors as adults.
Large families born to a couple who rely largely on benefits - due to poor health/limited education/low skills/a culture of women not working outside the home, will typically grow up to have very similar adult lives. They're also likely to be large net money takers. So an additional lifelong cost to the public purse. Not additional contributions.
Being a parent is a great source of happiness for many, but if we need significant means-tested benefits (and/or are heavily subsidised via social housing), we should stop at two children. It's taking the proverbial to be so reliant on other people's money, and to keep demanding more money for your third, fourth and fifth child. And, no doubt, demanding to be rehoused in a much larger council house.
I am furious by the removal of the Cap.