Republicans supported the insurance companies who cried that a "public option" would have been unfair to them?

I guess they think that being able to pull out of the "child only" insurance market is fair? The insurance companies' concern that some parents refusing to cover children until they get sick is valid. So, establish an open enrollment period, where you can only sign up for insurance during that time frame. Pulling out of the child-only insurance market sure isn't fair - to the children that is. But, Republicans aren't screaming about that. Does that mean they're on the side of the insurance companies and not the children?