First let me ask you something....have you ever done something which scared the hell out of you? Skydive, rollercoaster, fast driving, etc?
It's so absurd to compare waterboarding to skydiving. It's more comparable to rape. Repeatedly being made to feel as if you were drowning would clearly have long lasting psychological effects on a normal human being. My brother was very cruel and used to hold my head underwater, it was horrifying and I believe to this day it has an impact on my personality.
You just don't want to admit that you believe the ends justify the means. Paint it any way you want, but you're being dishonest. Skydiving? Seriously? That's pretty weak IMHO