"[T]he best example of contemporary trends and consensus in favor of a right not to kill comes in the abortion context, where protection of conscience has been almost universal and has all occurred within the last fifty years. In the years prior to Roe, at least fourteen states had already liberalized their abortion laws. These pre-Roe liberalization laws frequently came with the creation of express statutory protection for physicians and other healthcare personnel and institutions that refused to participate in abortions. Likewise, when it decided in 1970 to support great er access to abortion, the American Medical Association also resolved that “[n]either physician, hospital, nor hospital personnel shall be required to perform any act violative of personally-"