> The dissents’ positions in the end boil down to ignoring the Constitution’s separation of powers and the Court’s precedent and instead fear mongering on the basis of extreme hypotheticals about a future where the President “feels empowered to violate federal criminal law.” [...] The dissents overlook the more likely prospect of an Executive Branch that cannibalizes itself...
Also important to note is that the hypothetical didn't sprout from thin air, Trump's lawyers (whose arguments SCOTUS in large part accepted) acknowledged that extrajudicial assassinations would fall under official acts.
https://thehill.com/regulation/court-battles/4398223-trump-t...