I guess the point is that killing is more emotional than thought out, in most cases.
I'm not sure that we can control, perfectly, our emotions.
Good point. I know I could if furious enough and depending on being able to justify it with myself, would not have any remorse.
I did think I had killed someone once (accidentally) after I had hit them and they split their head open on the floor. I was scared shitless.
All the aggro and what not faded pretty quickly and I just hoped his head would stop bleeding and that he would wake up. I worried about going to jail and explaining things and whether I would see my kids and a million other things.
There was the same regret that a thief has when caught after the event. I regretted not the action but the probable punishment.
Also he was not worth me putting that at risk. It was stupid. That was many years ago though.