America is trapped in a cycle where political parties have discovered that fear and anger drives voters whereas contentment with status quo does not motivate turnout. This leads to a scenario where parties will actively sabotage the resolution of painpoint issues such as immigration, healthcare, gun control etc. so long as it continues to create anger and fear that they can successfully blame on the other party. This behavior extends to voting against their own proposed policies in the interest of seizing/maintaining power over problem solving. And now deliberately creating crises (both real and fictional ones) has become the game-theory dominant strategy in American politics.
Even for politicians who are not absorbed in wedge issues, meaningful reform is a long term task. It would require multiple elections in a row showing that there is a durable political coalition for universal healthcare.