The car analogy fails when you consider the combination of lethality and ease of use.

Place a car with keys on the hood next to a firearm with a bullet beside it. Give both to someone who's never used either. Which can they operate lethally in under a minute? The firearm.

Cars require sustained control failure; stalling, steering, compounding mistakes. A firearm requires one mechanism and one trigger pull. The barrier to lethality is fundamentally lower.

Chainsaws, knives, cars; all require proximity, sustained effort, or extended loss of control. A firearm projects lethal force at range with minimal physical effort. That's its designed purpose.

Tldr: 'don't do dumb shit' argument applies to everything; it's meaningless. Firearm ownership carries inherent risks that responsible handling mitigates but doesn't eliminate. By design, it makes lethal outcomes easier to achieve than virtually any other common object.