Once you sort out the lies and hyperbole, you are left with a significant cost to the taxpayers because of a diminished pool of healthy enrolees. Second, with the destruction of Obamacare,many people, particularly those with pre-existing conditions and those whose lives depend on Medicaid will be imperiled once again.
Trump and the GOP are willing to destroy Obamacare and Medicaid and possibly, Medicare because they are not threatened politically if they do so. Until they feel that doing so will cost them their cushy seats in the White House or Congress , they will keep trying until they succeed .