I have to agree with the OP on the hit. The DB didn't launch himself, he didn't lead with his helmet, hell, it looks to me like the only reason the hit looks as bad as it does is because of the incredible inertia Vernon Davis brings with him. The safety came in under control and laid his shoulder pads into the ball and separated man from ball. That looks textbook to me, and as safe as a hit in the NFL can be.
Mike Lantry, 1972