Yeah, that always irritated me to. They'd always say oh how horrible it must've been for got to watch his son tortured and killed. A) if he'd wanted to he could've stopped the torture and had him die painlessly and B) it's not quite the same as a parent watching their child die because he knew he'd be back. Anyone who thinks that god had it rough watching Jesus die must go through horrible trauma every time they watch their child fall asleep!
Taking your point a little further, why is it that if someone is technically dead for a couple days that they don't come back perfect? Death is the price of sin, and they've paid to the same standard as Jesus, so when they come back they should have been raised to perfection and live forever!