That isn't to say there are no conservatives who care about health care, because there are a few (like the folks at the Heritage Foundation who came up with the individual mandate!). But they are few and far between on the right. Your typical Republican, on the other hand, cares deeply about issues like taxes and defense policy, and works hard to understand them and come up with ideas for where they should go in the future. But had President Obama not passed health-care reform, they would have been perfectly happy to let the status quo continue indefinitely. They donned their fervent opposition to Obamacare like a new jacket, for reasons of politics, not policy. Sure, it was in many ways a conservative plan, much of whose complexity comes from the fact that it works to expand coverage within the private market. But it was big and important, and it was Obama, and it was a way to articulate their anti-government philosophy, and so they got fired up about it. But it isn't because health-care policy is something they're passionate about. Republicans care about taxes whether or not at the moment we happen to be having a big public debate about taxes. But if we weren't debating health care, they wouldn't be staying up nights coming up with interesting solutions to health-care problems, because it just isn't their thing.