Because many people who supported the PPACA, both popularly and derisively known as Obamacare, did so from moral fervor and political partisanship (as did many opponents, often with the added fecal nugget of racism dropped in) they were utterly uninterested in any epistemological or evidence based evaluation for the claims that Obamacare would lower premiums, deductibles, and health care costs.
Supporters took it as an article of faith that Obamacare would do all of those things. And if you questioned that belief or wondered if there were a better way of lowering health care costs, lemming like supporters squealed that you were a dummy, a useful idiot for Republicans, or worst of all some sort of hateful right-wing conservative cretin misogynist misandrist who just wanted people to die.
Silence heretic!!!!
Well.