I agree, that’s how it would go. But you can’t start advocating for a Democratic president to murder his opponent with official impunity, just because of some politically motivated bullshit SCOTUS ruling. That way total anarchy and facism lies.
If people start calling for that, then it’s no better than the shit show of a second Trump presidency may be. The rule of law matters, and it should apply to all equally. If Trump did it and got away with it, it would be bullshit, he should not get away with it. If Biden did it, he should not get away with it either, whether it’s “official” or not. Murder is murder.