Originally Posted by JohnKSa
...As far as his statement that kinetic energy does not wound, that's simply nonsensical from a scientific standpoint....
But I think that the point he's trying to make is that energy as a indicator of a defensive handgun cartridge's effectiveness is not helpful and even counter productive. He is, in essence, responding to what amounts to an obsession with energy, even at typical handgun velocities.
We so often see the passionate claims that cartridge A is superior to cartridge B because it has 500 ft-lbs of energy at the muzzle compared with the meager 450 ft-lbs of cartridge B.
To be sure, a projectile that is moving had kinetic energy. And a bullet to effectively penetrate must have some minimum level of kinetic energy. But factors such as sectional density of the bullet, momentum and diameter/expansion of the the bullet and thus the permanent wound cavity are more useful and relevant to trying to predict terminal performance, at least at typical handgun velocities.