It’s a legitimate question. I don’t think humans come out of the box as no-mercy unadulterated killers. And there are many who might have to think about it. Youngsters, elderly people with limited mobility, some people of certain religious inclinations.
We’re not all the same like we were stamped out by cookie cutters.
The time might come when people have to band together, with whatever talents they have. An older person or person who has religious objections to killing might still have very valuable talents and be a major contributor, while others take on the duties of guarding and defending.
We’re simply not all the same.
You don't have to be a "no-mercy, unadulterated killer" to use deadly force to protect the lives and property of you and your loved ones, when they're being threatened with deadly violence.
It would be unmerciful in the extreme for a person to have to "think about it", when mere seconds separate them or their loved ones from death or other serious harm.
The time might come when people have to band together, with whatever talents they have. An older person or person who has religious objections to killing might still have very valuable talents and be a major contributor, while others take on the duties of guarding and defending.
That's a very romantic picture you paint, but ultimately, it's utopian for a SHTF situation. Perhaps such communities would eventually form, but those who managed to survive the worst of the apocalypse would probably be strong survivor types, who had no reservations or hesitations about self defense.
The rest would already be dead.
We might not all be the same, but even at their most basic level... a normal human being will do whatever it takes to stay alive.