People are forgetting we're a union of fairly sovereign states. In 1969, as you have today, some states allowed abortions, and other prohibited or restricted them. Thus it was decided democratically, as it is in most of the rest of the world. But when the federal government can come in and preempt state law, because the USA as a whole has a different idea, or in the case of Roe v. Wade, the unelected judges had a different idea, that is going to cause friction.

Also, the power of the federal government to impost laws on all states is highly controversial, and its history full of other supreme court cases carving out the definition.

You see the same friction with EU freedom of movement laws and immigration.