Some people are just douche bags plain and simple. Sometimes people use humour as a way to deal with these kind of things.
Everybody deals with things differently. This is how they deal with it - by not dealing with it.
Maybe because they themselves have never felt the pain of loosing someone. Or maybe instead of the pain, it is eaiser to laugh. Or maybe they have no heart at all.
Which would mean evil.
You don't quite grasp humanity. Humor is a very natural response to horrific tragedies, and if executed well, can breech any taboo. The problem with joking about sensitive matters is skill. A crude and poorly timed joke can often cause a lot of harm.
You are taking my generality and focusing on a specific. No, of course there is nothing funny about any of the tragedy in specific. What I am saying is that people use humor as a way of coping and healing with tragedies too horrific to grasp. I'm sorry if you don't like it, I'm merely stating facts.
Some people have no heart..