Assassination is on everyone's mind thanks to the arrest of an armed felon
apparently attempting murder at Kavanaugh's house. Assassinating a Supreme Court Justice is an obvious step in certain respects: they have a lifetime term, impeachment requires an unattainable supermajority, and you get to appoint a replacement right away if you happen to control the White House and Congress. Partisan power games are such right now that there's no doubt the party in power would be willing to effectively endorse the assassination by using it to seize control of the Supreme Court. That this would also effectively endorse assassinating political figures in general, themselves included, might be worth the price to them. Such is the lust for power among our political elite.
Murder is one of those things that is always wrong, but murder is properly defined as "the intentional killing of the innocent." The intentional killing of the guilty is not always wrong, can be justifiable or even praiseworthy. The philosophical case for assassination begins with the idea that it can be a form of intentional killing of the guilty. Lots of people philosophically endorse the idea that assassinating Hitler would have been justified, for example.
Likewise, the philosophical case for assassination goes on to point out, the guilt of the political figure is often the actual and relevant guilt. If instead of assassination a dispute devolves into war, soldiers and policemen and outright innocents are likely to be killed who bear little or no guilt relevant to the dispute. Soldiers especially are likely to be honorable and to possess significant virtues of courage and self-discipline; the politicians we are protecting by fighting wars instead of assassination campaigns are usually neither honorable nor virtuous. It would arguably be much better to shoot the politicians one by one as they need it than to have the ordinary people slug it out on their behalf.
Governments and churches -- including the Church -- oppose assassination, but I often wonder if their unity here is more to do with the fact that they all represent a form of institutional power. Archbishops and Cardinals, and certainly Popes, might well worry that they too could fall prey to an assassin's bullet or blade. Keeping the structure of conflict pushed away from the powerful, with actual violence falling on the shoulders of the poorer and ordinary, is definitely in their self-interests as individuals, as members of their class, and as members of their institutions. Legislatures and churches may not be the most reliable source of philosophical insight to be had in this case.
I do not write to endorse the concept, but to raise the matter for consideration. Apparently a fair percentage of our youth, women as men, Republicans as Democrats, have come around to the idea. It's probably a good time to think it through.