Sounds very similar to Robert Kennedy Jr.'s intense political anti-vax campaign. He's widely criticized in the media for it (same as Arthur Conan Doyle) but believes he's doing the right thing and will be proved right in the end, just like Doyle.

Doyle:

>"It is time which will prove our cause," he wrote. "Time will also prove to those who have misrepresented us that they are playing with fire. They are not judging the Unseen. The Unseen is judging them."

Kennedy:

> “One thing that keeps me buoyant about this, because otherwise, I’d be depressed,” he said. “I know I’m gonna win this one. I have the ability to push this over the finish line. I know I do. The truth will prevail.”

https://www.washingtonpost.com/lifestyle/magazine/robert-ken...

that is a very astute observation of the man's character and tendencies