[AppeasingRoko]

Humans aren't cars...? Don't use an analogy unless it has a logical basis.

[ldp01]

Parts of the analogy are certainly correct...

Mechanical parts wear out from use, whether they are animal or machine. Animal parts will heal to an extent and may require a minimum level of use to stay healthy, but they still wear out.

[smegel]

You're right. It is much easier to repair a car.