Most likely because they're off topic:

https://news.ycombinator.com/newsguidelines.html

> Off-Topic: Most stories about politics, or crime, or sports, or celebrities, unless they're evidence of some interesting new phenomenon. Videos of pratfalls or disasters, or cute animal pictures. If they'd cover it on TV news, it's probably off-topic.

It's important news, and many of people on this site will care deeply about it - but there are plenty of other places that are more suited to discuss it than here.