Republicans are engaged in a brutal civil war between hard-liners and moderates as they struggle to craft legislation to repeal and replace Obamacare. The episode invites an almost existential question for the GOP: Why, after seven years of nearly endless war against Obamacare, is the party unable to deliver a more conservative policy that provides access to health care to a similar number of Americans?

As a life-long Republican who has spent months contemplating this question, I’ve come to an answer that will be hard for many conservatives to swallow: Passing an Obamacare replacement is difficult because the existing system is fundamentally a collection of moderately conservative policies.

In crafting their health-care plan, Republicans have come to the uncomfortable realization that there simply isn’t much room to the political right of Obamacare for a policy that covers as many people with high-quality insurance. Furthermore, many have realized that there isn’t much political will for a bill that covers meaningfully fewer people or that places low-income individuals in insurance plans with cost-sharing elements they can’t afford.