Paul Krugman makes a good point -- the main point: the implementation of Obamacare scares the hell out of them. Not because it won't work but because it likely will work and become an ingrained part of who we are.
Better-informed people on the right seem, finally, to be facing up to a horrible truth: Health care reform, President Obama’s signature policy achievement, is probably going to work.
And the good news about Obamacare is, I’d argue, what’s driving the Republican Party’s intensified extremism. Successful health reform wouldn’t just be a victory for a president conservatives loathe, it would be an object demonstration of the falseness of right-wing ideology. So Republicans are being driven into a last, desperate effort to head this thing off at the pass. ...Paul Krugman, NYT
And if that happens, they are likely to do some real harm.
... Will Republicans actually take us to the brink? If they do, it will be crucial to understand why they would do such a thing, when their own leaders have admitted that confrontations over the budget inflict substantial harm on the economy. It won’t be because they fear the budget deficit, which is coming down fast. Nor will it be because they sincerely believe that spending cuts produce prosperity.
No, Republicans may be willing to risk economic and financial crisis solely in order to deny essential health care and financial security to millions of their fellow Americans. Let’s hear it for their noble cause! ...Krugman, NYT
We've seen this happen before. Crash. Recession. Repeat. Rich get richer. Poor get poorer.