Politicians are always responsible for deaths of their constituents as an indirect result of their actions, it’s just a question of how many. We set up legislative and judicial systems to address this question rather than relying on mobs and vigilantes. It’s called living in a civilized society. It’s not about decency, it’s about creating a safe society we want to live in. Personally I don’t want to live in the wild west where anyone with a gun can play judge, jury, and executioner; you may feel differently.
But I agree that the recent SCOTUS ruling is worrying, because it does appear to put the president above the law. As JFK put it, “Those who make peaceful revolution impossible will make violent revolution inevitable”. Not good, not preferable…but inevitable.