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Cycling is great for giving an appreciation for what 20-30mph really feels like, without the car disconnect. Same as your sprinting example: go get a bike, find the steepest hill you know of, pedal as fast as you can down the hill (this is going to be 30-40 mph), then ask yourself if you'd like to hit a brick wall in that moment. Most people who are otherwise comfortable riding without seatbelts would be peeing pants and grabbing brakes long before 40mph.

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These are both pretty terrible arguments, due to http://en.wikipedia.org/wiki/Impulse_%28physics%29 Cars have crumple zones for a reason. This is not to say seat belts aren't good, as they along with air bags contribute to impulse, but there's a huge difference between shooting an egg (or person) at a brick wall at 50 mph while naked, vs. encasing it in sufficient amounts of bubble wrap first. I'll gladly sprint into a tree, or ram a bike into a wall, at such speeds provide I or the tree/wall are sufficiently padded. (https://youtu.be/DEP8juRSBRo)

Neither are terrible arguments. They are not exactly equivalent, obviously. A car does have crumple zones, meant to slow deceleration of the vehicle itself. It is assumed that passengers and objects are somehow attached to the car, such as by a belt device of some sort I imagine. The crumpling effect doesn't help you when you propel into the person in front of you, or as in many cases, through the windshield itself and into something that's not so crumply.

You absolutely would not drive into a wall sans seatbelt at 30mph, even with a newer car. You'd be a fool to do so, as you will get injured and MAY not survive said injuries.

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