system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do people scream when they’re frightened?

I’m genuinely curious about this because it seems like every time I see footage from a disaster, shooting, etc. All you can hear is screaming when, in all honesty, it would be disadvantageous to do so (specifically in regards to aforementioned shootings) since that would draw more attention to one’s self.
gpt
It's an alarm system. It ensures everyone is paying attention, and any and all friendlies or neutrals can hear and either move to help or secure themselves. It's not a rational reaction, it's an instinctual one.