If the author is claiming that once it's compressed it won't be as good next time, then that's insane - helmets aren't supposed to be re-used after accidents W

If the author is claiming that once it's compressed it won't be as good next time, then that's insane - helmets aren't supposed to be re-used after accidents Why is it insane to think it won't be as good next time? Isn't that exactly the reason you are not supposed to re-use them?