What do you think of my saying "who cares" when they're talking about a guy who is dying of cancer?
Why would you do this? What guy is dying of cancer?
He's a friend of my coworker.
You may not care at all and that's fine since you don't really know the person, but saying "Who cares" can hurt those that do know him and so it is much better not to say this. How would you feel if someone said who cares about one of your relatives or friends dying?
It's not like anyones going to ask me to switch shifts with them anymore. I'm going to say "who cares" when my coworker brings it up.
You don't really need to care about someone that you do not know, but it could cause problems if you openly tell people that you don't care about this.