You're dead wrong on this. You're not considering vectors. A guy may make contact but he's spent a lot of energy elevating. In addition, unless you go strait up on D now, its usually a foul. In addition, most NFL contact is shoulder led, a more 'pointed' surface than a whole body smacking into another (chest to chest), the more surface area, the more the force is spread.
There are few opportunities in the NBA to even approach the ferocity of the direct contact in the NFL. I honestly get scared for those guys when I see them on Hard Knocks. Its a vicious sport. There was an excellent article in Esquire, I think it was last month, that speaks about the problem the NFL has. The player is bigger and stronger than the forces that the body being struck can tolerate.
It was measured on a box out, no jumping. It would probably be a foul in game, but that doesn't mean it never happens. Big men get beat up in the post, being blindsided by an unexpected screen hurts, and taking charges suck.
That said, yeah, I can't argue the NBA is more dangerous than the NFL. I find most injuries occur with contact to the head, knee, or when the player is blindsided - stuff that doesn't usually happen in basketball. The contact force I think is there, especially if you account for pads, but it's not not nearly as often or targeting vulnerable areas.