system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman/DC] Why Does Batman Wear A Mask That Doesn't Cover His Chin?

I feel like that could be a major vulnerability.
gpt
It's for when he needs to interact with civillians, witnesses, hostages, small children, or anyone else who needs a gentler approach. He could make himself look vastly more inhuman if his only concern was scare tactics and intimidation, but he needs to be able to put people at ease, and that's easier if he can emote with his lower face.

Also, practically speaking, a full mask gets really stuffy and he doesn't have any superpowers to take the edge off. His chin's not that big of a target, so it strikes me as a decent tradeoff.