I remember a few guys in our survival school class that had a real problem with wacking a rabbit on the head. Some were really squimish about eating a worm or a bug. I guess it's good to get over that kinda thing before you need to get over that kinda thing. The time factor is also very important in a training enviornment, as you had stated.What they learn from the wild game exercise is how to clean it and cook it.
Many of these men are very new to the outdoors and in a classroom enviroment as such the "course of instruction" on preparing rabbit can't wait 3 days for someone to actually catch one. In that approach they will teach how to trap or kill and teach how to cook, all with both classroom instruction and practical application. Then the students go to a "testing" phase and have to put these new skill sets to a test. The final phases are only lightly supervised and you have very limited starting resources. In the last part you either eat or don't depending on how much you picked up on in your training phase.
When I have done this training in bridgeport, Ca. I have literally seen grown men cry over catching a trout, so I think the standards for roughing it are pretty high.