Who cares if an arrow with 100 ft. lbs. Chances are that you are not going to kill the critter any time soon anyway, if you hit hard bone. But that is not to say that it is irrelevant to try shoot a higher velocity arrow. After all, its the velocity that allows you to shoot a flatter trajectory and that greatly increases you chances making a killing shot. If you want to talk about trajectory and velocity then you have to talk energy.
Energy is the resisting force times the penetration distance.
So what we are really talking about here is the fine art of compromise. The idea is to pick the heaviest arrow possible and to shoot it at the highest velocity possible within the limits of what we can reasonably accomplish. It seems to me that what is important for both the game and the hunter is for the hunter to make a good clean shot into the vitals of the animal. Although it is fun sometimes to get involved with these philosophical arguments. It is important for all of us to keep our priorities straight.