With all of the millions, billions, trillions spent on the military and science fields, NO ONE thought "hey, these being have super sensitive hearing, lets try to blow their figurative ears out?" And once their heads open up from a certain frequency, NOW they're susceptible to bullets?
Plus, there's no way in hell she had a childbirth that quiet to avoid certain death. Even if she didn't make a sound, that baby is gonna be loud as hell.
Not to mention, you know damn well there was a nail on the steps when your laundry bag got caught on it. You do absolutely nothing about it, despite taking the time to cover walking paths with sand and walk barefoot so as to not make a sound, just to step on it during a crucial moment on some Marv from Home Alone 1 shyt.