Listen, different strokes for different folks. Some people are comfortable making jokes about things that are deathly serious/tragic/sad.
For example, I was once talking to someone the day that two frum men in the community were walking when a utility pole fell on them and nebach killed them. Horrific tragedy. The fellow I was conversing with made the following "joke": I could just imagine their wives saying to them while they were walking "yankel, come home already, I need you to take out the garbage" "ok, ok, I'm coming..." " I'm serious, I need you NOW - I'm gonna kill you if you don't come home." End of "joke".
True story. I didn't find it funny, and I didn't laugh. But obviously this fellow found it funny.