I’m guessing you’ve never seen a person hit by a car before. They don’t deflect away like video game characters. A person hit roughly in the middle of their body will be “folded” over the car, smashing their head into the body of it. Then they’re either flung away, roll over the top, or get pulled under, depends on what the driver does, how hard the hit was, and how big the vehicle is.

In a car with a molded plastic body, the head bounces back off and the plastic is dented. With a plate of solid steel, the person’s head is splattered like a melon all of the “bulletproof” windows. Then the sharp edge slices them in half. Sounds very metal until it starts happening to children several times a week.