Normal humans feel a connection to people they don't know personally, usually because they admire their work or their association with a sports team they support. I hope that helps. If you genuinely can't understand that or never experience it yourself then there is actually something wrong with you.
And that doesn't mean that anyone here is stricken with grief and inconsolable. That and indifference are not the only two options.
People of a certain age, myself included, remember him fondly and are thus a bit sad he died, especially as it was so young. That's it.
If you genuinely don't get that then you probably need to see someone.
If you do and are just pretending not to then why bother?