Both are capable of killing people if used improperly.

If the gun was to go off and kill someone, you would be held responsible. One of the most basic rules of gun safety is don’t point it at anything you don’t intend to shoot.

If you lie a loaded gun on a table and it discharges and hits someone it’s your fault for being so careless.

You must always expect a gun to go off if it’s loaded. I cannot stress this enough. This is basic gun safety.

Now for cars, yes tesla could be done for false advertising and reckless endangerment. But the driver still retains fault. They could not control the vehicle properly and killed someone.