What purpose does this subtitle serve?

I think it’s the first one but it depends on what the rest of the essay says.

Explanation:

I believe that to an extent, he was naturally corrupt, but what man isn't? Mainly, he was corrupted by power, especially after World War II. What many don't remember is that Stalin and the Soviet Union were possibly the most important factor in defeating Hitler and Japan! So I believe that Stalin was a slightly corrupted man who was broken into something horrific by letting his power go to his head.