One cannot help feeling a bit silly taking seriously the policy proposals of a person who seems not to take policy seriously himself. Donald Trump's policy positions have evolved faster over the years than a teenager's moods. He was for a woman's right to choose; now he is against it. He was for a wealth tax to pay off the national debt before proposing a tax plan that would enrich the wealthy and balloon the national debt. He was for universal health care but opposed to any practical way to achieve it.

Based on his previous flexibility, Trump's here-today proposals may well be gone tomorrow. As a sometime-Democrat, sometime-Republican, sometime-independent, who is now the leading candidate for the Republican presidential nomination, Trump has just issued his latest pronouncements on health care policy. So, what the hell, let's give them more respect than he has given his own past policy statements.

Perhaps unsurprisingly, those earlier pronouncements are notable for their detachment from fact and lack of internal logic. The one-time supporter of universal health care now joins other candidates in his newly-embraced party in calling for repeal of the only serious legislative attempt in American history to move toward universal coverage, the Affordable Care Act. Among his stated reasons for repeal, he alleges that the act has "resulted in runaway costs," promoted health care rationing, reduced competition and narrowed choice.

Each of these statements is clearly and demonstrably false. Health care spending per person has grown less rapidly in the six years since the Affordable Care Act was enacted than in any corresponding period in the last four decades. There is now less health care rationing than at any time in living memory, if the term rationing includes denial of care because it is unaffordable. Rationing because of unaffordability is certainly down for the more than 20 million people who are newly insured because of the Affordable Care Act. Hospital re-admissions, a standard indicator of low quality, are down, and the health care exchanges that Trump now says he would abolish, but that resemble the "health marts" he once espoused, have brought more choice to individual shoppers than private employers now offer or ever offered their workers.

Trump's proposed alternative to the Affordable Care Act is even worse than his criticism of it. He would retain the highly popular provision in the act that bars insurance companies from denying people coverage because of preexisting conditions, a practice all too common in the years before the health care law. But he would do away with two other provisions of the Affordable Care Act that are essential to make that reform sustainable: the mandate that people carry insurance and the financial assistance to make that requirement feasible for people of modest means.

Without those last two provisions, barring insurers from using preexisting conditions to jack up premiums or deny coverage would destroy the insurance market. Why? Because without the mandate and the financial aid, people would have powerful financial incentives to wait until they were seriously ill to buy insurance. They could safely do so, confident that some insurer would have to sell them coverage as soon as they became ill. Insurers that set affordable prices would go broke. If insurers set prices high enough to cover costs, few customers could afford them.

In simple terms, Trump's promise to bar insurers from using preexisting conditions to screen customers but simultaneously to scrap the companion provisions that make the bar feasible is either the fraudulent offer of a huckster who takes voters for fools, or clear evidence of stunning ignorance about how insurance works. Take your pick.

Unfortunately, none of the other Republican candidates offers a plan demonstrably superior to Trump's. All begin by calling for repeal and replacement of the Affordable Care Act. But none has yet advanced a well-crafted replacement.