system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman] Why does batman have an unprotected chin in his cowl? It feels like a huge weak spot, does it give him any sort of advantage?

A good marksman can shoot him through it, a good punch can land on his chin causing extra damage, with protection he'd be better able to hide his voice resulting in extra safety from detection. Why doesn't he just have a full face mask?
gpt
Multiple reasons have been brought up over the years.

1. Obstructions over his mouth and nose can make it difficult to breathe. Certain masks in certain combat situations might be invitations to suffocate him. 

2. It humanizes him. When Batman shows his compassionate side, like when comforting children or reassuring people who were victims of the thugs he just punched, he needs to show that there's a human being under the cowl. A mouth and a jaw lets him communicate that with clear words and clear intent. 

3. Similarly, a clear mouth makes it easy to communicate in general. Also, on-the-fly detective work requires clear senses. It's not advisable for people to sniff or taste chemicals/evidence in the field, but when lives are on the line, he'll do it. And Batman being Batman, he'd be able to deduce what he needs to know from it. 

4. Now and then, he says it's to mock the Joker. It shows that he's never amused by anything the Joker does, and sometimes it shows the opposite. It keeps the Joker on edge and obsessed with Batman, which thus adds a *tiny* bit of predictability to the clown's actions.