One confusion here is thta people seem to be thinking that humour is all about fun and being lighthearted. And that is just not always true. There is such a thing as satire, and using humour as a weapon or a tool.

I imagine a song about this probably would take a satirical form, casting a quizzical eye at a society where a hands-off attitude towards death allowed this kind of thing to happen. It wouldn't be a fun song. But it might adopt a joking tone.