Nothing. They're behaving quite rationally.
You just have to understand that their motivation is not "successful governing" or "making the world better" but rather, "getting more money."
When you view their actions through the lens of self-enrichment, they're behaving quite normally.
The ACA, while not perfect, literally saved my life. It prohibits lifetime maximums and eliminated the idea of pre-existing conditions.
Without that, I'd be dead.
Don't let perfect be the enemy of good.