Valid points about dogs, shep.
The energy isn't what does the damage, per se. It's the ability to penetrate skin, muscle, bone and organs. Sectional density and adequate impact velocity to get the projectile through the above mentioned is what does the damage. Yes, ultimately (from a Quantum Physics perspective) it's energy, but the comparison with the baseball isn't a good comparsion since the baseball (which would put you down temporarily) will not penetrate your skin: too much surface area.
"Necessity is the plea of every infringement of human freedom. It is the argument of tyrants, it is the creed of slaves." ~ William Pitt, 1783