Just a reminder
The remainder of the paragraph you quoted (and the one following) proceeeds thus:
In an opinion by Chief Justice William H. Rehnquist, the court suggested it was up to the individual states to decide whether to permit or ban the practice.[emphasis added]
The issue now before the high court is whether Congress could step in to prohibit assisted suicide if a state chose to allow it, and, if so, whether the federal Controlled Substances Act authorizes the Justice Department to do so.
I personally favor physicians being permitted by law to allow terminal patients to take their own way out. I've lost two close friends, younger than I, to cancer, and a family member to MS.
Nevertheless, there is an ethical question having no bearing on "conservative" politics, which should remain the choice of the individual physician: the Hippocratic Oath, which says "First, do no harm." In other words, "harm" is in the conscience of the beholder.