To follow up on Spotlight, it wasn't about the scandal. Duh, we already knew what the "big reveal" was going to be. It was more a statement about journalism.
Every one of the reporters, at one point or another, had a stake in NOT reporting the story. And they all missed it in the first place because they had been on the inside for so long that they couldn't see it. It took an outsider (Barron) coming in to kick them into gear on it.
In order to be a good investigative journalist, you have to constantly question your own assumptions about everything and be willing to keep digging even when it affects you on a personal level because of how the story can hurt people you love. In this case, they needed to question their assumptions about the church. THAT was the film's real message.