We have thin skulls (that knit together after we’ve been spat out our mother’s birth canals). That skull protects the 2 pounds of jelly that passes for our brains.
We have a thin atmosphere; scaling down to the earth as a basket ball, it’s the thickness of a postage stamp or so. It “protects” us from the space in which nobody can hear us scream.
Doing crazy cycling stunts without a helmet is WAY less stupid that what we are doing to our atmosphere.
