I'm not entirely sure that's true. I think a lot of the anti-ACA lobby is doing it for purely partisan reasons. If the ACA succeeds then its a counted as a big win for your opponents, so you fight like the dickens to make sure it doesn't work out.

Similarly, a lot of people that support the ACA don't support the ideas behind it, as much as they support something being done from the previous, untenable situation. Obama took mostly Republican ideas and ran with them, now the Republicans have disavowed any involvement with them, and Democrats have adopted them as good (or at least better than what was there before, even ACA supporters acknowledge that it's a deep compromise from what anybody wanted.)

I think that the attitude of "it's going to help my side or nobody" is a much stronger driving force than the desire to prevent people from taking entrepreneurial risks.