What I have stated is that with all other factors being equal, a bullet of a given construction and mass and significantly higher energy is capable of and can be expected to produce greater damage than the same bullet with significantly less energy.
Which is incorrect as I already pointed out. I can think of two examples off the top of my head, there are probably more:
1) An FMJ non-expanding bullet. Once it has sufficient velocity/energy to fully penetrate the medium you're shooting it through, adding more velocity/energy won't necessarily produce any more damage than the slower bullet.
2) A lightweight highly frangible bullet. If you shoot one at the optimum velocity/energy for optimum upset and maximum damage, and then increase the velocity/energy you will not necessarily get greater damage. Especially if the shot is into something tough like an animal's shoulder, the bullet with higher velocity/energy may just fragment and fail to penetrate with less damage.
And come to think of it, #2 is not just true for lightweight frangible bullets. Lots of cup and core bullets won't work optimally if they're driven too fast. And the same can be said for some of the soft lead conical bullets used in muzzleloaders.
