The butt-hurt people have over cliffhangers is astonishing to me.
"Who shot J.R.?"
"Mr. Worf... fire!"
"What's inside the hatch?" (probably the most equitable since it's a more recent TV series and it centers around something the show spent a good deal of time on in an arc during the season.)
So, really? This moment is going too far with the cliffhanger? Are people really that weak?
Anyway, interesting thing to note that throughout the episode we're given several POV shots of someone trapped in the van and then at the end we have the POV shot of the person meeting Lucile. So this, could, mean that the person killed would either be Daryl, Glenn, Sasha or Rosita; assuming there's a thread between the POV shots which if there isn't then it's sort of a directorial misstep or some *very* poor foreshadowing.
Actually Negan is more tolerant than Rick in some ways. RIck would have shot all the trouble makers in the head men and women with the "I don't take chances" b.s as an excuse. In some ways Rick is worse than Negan.
I think it's hard to say/know if Rick would shoot all of the trouble makers if the situation were reversed, maybe he would have. But if the situation were reversed Rick would be dealing with a group of people who've killed a great number of *his* people. Let's be honest, Negan would be "justified" in killing all of The Group given the sheer numbers they've killed of Saviors. But Negan doesn't want to kill them, he just wants to demoralize them and have them "work for him." So he only kills one person to make an example of them.
But, it's still foolish to think Rick's position is anywhere close to Negan's. Rick was, afterall, willing to recruit Jesus to their group after running into him on the road. He's only "not taking chances" in this circumstance given what they are facing. He's not going to around killing indiscriminately like Negan and the Saviors do; remember Negan's group are *still* the ones who target and kill other communities and extort them for supplies in exchange for "protection" ... from them.
So there's a world of difference between what Rick and The Group do when it comes to killing (in some manner of self defense) and what The Saviors do (kill as a show of force and manipulation.)
Killing is part of this world now, the only thing that really matters is *why* you kill; and killing in self defense is one thing (and the raid on the Saviors' cable/satellite station *was* a form of self-defense) but killing as a show of power (what The Saviors do) is something else entirely.