If that were true a conservative based healthcare reform like the ACA would never have been passed by a democratic controlled congress. For better or for worse the left has been much more open to compromise
Both sides compromise, but only when they think they are getting the better deal. There are moderates on both sides who get things done, and there are extremists on both sides that stifle progress. One side is not better at compromise than the other, in any regard. They are all politicians, and they are all motivated by the same thing: power and self fulfillment.
