Because most of us don't believe the 'Cheaper' part at all, considering the particular old-boy network of insurers, pharms, providers, politicians, and agenda organizations behind it, as well as the outright lies propagated to push it through including the outrageously corrupt costing process used by CBO.
As far as 'Universal' goes, we mostly think the only thing correct about that part is that the care recipients are going to universally get screwed from multiple directions.