Well...so much for the harsh realities of a post-apocalyptic world where everyone is struggling to survive. Fallout 4, literally, does not allow you to actually be a badguy. At worst you could be a kind of anti-hero who ignores people, and only does quests because there's extra money or a reward at the end. The game will not allow you to kill certain NPCs due to them holding the 'essential' status because they're vital to the story.
While I get that this isn't a big deal to most people, I personally expected Fallout 4 to be a little more open in it's ability to handle various different styles of gameplay. But clearly playing in a manner other than a heroic 'goodguy' isn't really supported by Fallout 4. It's like they designed Fallout 4 for children incapable of handling more dark and serious styles of play. Which is fine, I guess. That's the game the wanted to make, and the story they wanted to tell. I'm just disappointed because I expected a little more. Nobody's fault but my own, I guess.
But as long as we're on the topic, does anyone maybe have a mod to turn off the 'essential' status of these NPCs? Or would that actually cause the game to crash?