system
Given the following post, respond as if you're commenting on Reddit:
human
Why wasn't Batman an ideal green lantern candidate?

I'm sorry if this question has been asked before, I tried searching for an older post but couldn't find any. 

Why wasn't Batman ever chosen to be a candidate for the green lantern corps? Multiple iterations of Batman emphasize on the fact that he has enormous willpower. His constant struggle with himself to not give in to the temptation of killing anyone, and how he maintains his code just by willpower is  a very integral part of his character. Why did he never end up being a green lantern?
gpt
He wasn't ideal for one main reason:

He has channeled that willpower into repressing his parents' deaths. He's haunted by it, and the fear that results is one that he just can't overcome. His big motivation is ironically what keeps him from using the Ring.

Also, he has a huge reliance on fear. He's devoted himself to it, and so he's much like a Sinestro Corps. member, and GLs don't like the SC. It doesn't *exclude* him from being a member, but it hurts his chances.