The populism that Trump campaigned on is fundametally at odds with conservatism.  Health care exposes this contradiction.  Most people want access to affordable health care and they would prefer if that access was delivered through free markets.  But if the markets can't deliver, they are fine at the end of the day with government intervention in the market as long as it works.  An ideological commitment to the free market in all situations regardless of the negative impact on people is what fuels the GOP civil war.