So, Obamacare had a provision saying insurance companies cannot refuse to sell insurance policies on children who are already sick. Much as they might stop selling fire insurance if required to cover people whose houses are already aflame, insurers have responded by no longer issuing any individual policies for children, with the result that more children will now go uninsured.

This is precisely the kind of unintended consequences we libertarians warned of before the bill was passed. You cannot simply coerce the market into doing what you think is fair.

And don't expect them to learn their lesson -- as far as the statists are concerned the natural response to this evil corporate insistence on profitability is more regulation, eventually culminating in the same single-payer system that underperforms American health care so horribly everywhere it's used, complete with death panels (yes, they really exist, and are just wonderful according to Obama's latest appointee) and crushing tax burden.