You could apply that subjective value judgement to any number of jobs that are stressful and not world-critical important.

There's absolutely zero evidence that your brain determines its own health based on the importance of your task to the greater world.

Why hasn't Jerry Seinfeld melted down? How did Joan Rivers last so long? How is Howard Stern still functioning? Jay Leno? David Letterman? Sean Hannity? Jon Stewart? How about the thousands of tabloid writers across the nation? How about sports writers / journalists?

There's zero evidence for a link to what you're suggesting, in terms of value of the job being performed according to some external person's subjective determination.

Your value judgement doesn't dictate the self-worth or mental health of someone else, such that they're going to suffer a mental collapse because you think what they do is of low importance.