In a potentially deadly collision, what matters is the humans inside, not the car. Initial and final velocity are generally fixed, and the process of decelerati

In a potentially deadly collision, what matters is the humans inside, not the car. Initial and final velocity are generally fixed, and the process of decelerating the human is what needs to be done safely. This is why cars have "crumple zones", decelerate the car overall more smoothly, and why airbags are used, to decelerate the human more smoothly. (We're talking "my neck didn't break" smooth.) You can easily imagine a large truck formed as a rigid body that actually crashes worse than a tiny EV with a few feet of crumple in front of the driver. But all else equal, it's generally easier to design a survivable crash when there's more car to work with. Though EVs make it easier, by being able to use the "frunk" as almost purely crash mitigation, instead of also needing rigidity for the engine. Though the biggest factor by far is relative speed. It's 10x safer for everyone to be going 25 mph instead of 40 mph.