People want news. It’s a need as primitive as gossip. In fact, gossip is probably the answer to your question. But gossip is neither fast nor reliable, so people will inevitably invent news organizations to satisfy the need, as much as we have invented agriculture to satisfy our need to eat.

Perhaps when you say “news organizations” you intend a much more narrow definition, like maybe a “privately owned news organization”? That’s a dramatically different question though.