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Maybe that's good when hitting a tree? Slower deceleration, less force.

I think they meant that it's more difficult to stop before beginning to impact the tree.

Still. If I'm going to hit a tree, I'd rather drive a tank than a motorbike.

Cars have crumple zones which a motorbike does not.

A lighter car requires less work from the crumple zone to decelerate the car into non-fatal territory than a heavy car.