Your parents don't tell you what it feels like to be shot or stabbed when you're born.
They don't have to, because there isn't really any way to describe it. You can't know how it feels or describe the pain if you haven't felt it, lived it.
But why would they tell their precious baby boy or girl how that feels? Scaring them before they've actually lived. Triggering fear before they even know what fear is.
No, you can't describe how it feels to be stabbed. When it happens it just happens, it's so painful you can't even say you're in pain, because you're eyes are always so shocked that pain like that even exists. Your body goes numb at the sight of its own blood.
No one wants to be warned of that image, just like they don't want to listen when they're warned about falling in love.