Unfortunately no one can hear—they are ethically and morally tone deaf, with the additional affliction of being constitutionally, cowards. This means they have no courage. They have no DNA for fortitude and they will and do fold up like cheap suitcases.
Most of those capable of self defense and willing to defend thenselves are active and former military, or are old geezers in their fifties and sixties, like me...
I'm 40, a lifelong civillian, and am fully capable of and willing to defending myself.
My 19 year old son IS active military, though. He's Army Infantry, and honestly loves his work. (At graduation from Basic and AIT, I was there to add the blue braid to his uniform - proudest moment of my life) He's an adept of the martial arts, and a deadly surgeon with any firearm he's using. Shotgun, pistol,, rifle, belt-fed machine gun, doesn't matter. The boy knows how to send the lead wherever it needs to go.
Sorry, I can't help but brag. ;-D