The most compelling reason to learn to code is exactly the same reason to read lots of books (fiction or otherwise). It exercises your brain. A brain that can easily sort, parse, and understand basic logic and control flow is more resistant to propaganda and influence. Which is the same benefit a lot of reading does, but for different avenues of thinking (more worldviews exposed to -> more critical thought of each of those views -> more critical thinking in general).
But that in itself also isn't compelling to lots of people, why should they care about "exercising your brain"? I do it because it's fun, probably the most common reason I do anything, or because it feels nice. But probably exercising my brain for me is fun and makes me feel nice, this isn't true for everyone, sadly.
Besides the reward of a more capable brain, the reduced effects/risks of dementia, the contrarian need to argue, the altruistic desire to help neighbors with difficult problems, the selfish urge to daydream... yeah, there are people for whom none of those are motivating factors.
