Perhaps some fathers place too much on the sucess of harvesting deer and big racked bucks, that their sons don't want to hunt because they might fail their fathers expectations.
I had just the opposite problem with the two boys that I started. Both were real big on the outdoor video show scene, and both expected a trophy buck to walk out into the open field, stand there broadside, and take a bullet through the boiler room. They were pretty unhappy when the fantasy didn't happen, but hung in there for several years before they finally accepted the reality of the deer plan and threw in the towel.
PS....I'm quite surprised to readRSBs comments on the USP. I was under the impression that those guys never do anything good.