Im one of those people. Its partly acceptance and partly not caring. Everytime someone dies in my life there really is nothing i can do to bring them back and i accept their passing. Death is inevitable because we’re all have a lifespan. I’m also not a very emotionally attached person so that also prevents me from breaking down into tears whenever someone dies. I’m too detached from everyone to have their death affect me so much. I have cried before, when my brother died, but it was a couple weeks after he passed and only lasted maybe 5 minutes in total. It really just depends on how empathetic or emotional you are as a person in my opinion.