A flicker is still an alternate possiblity. The fact that all you get is a flicker is a function of the "cooked" character of these Frankfurt cases. In the real world, unless determinism is true, we have more than a flicker of freedom. Denying the PAP means that there are no alternative possibilities. No means no. We point out that there has to be some movement toward the opposite action in order for the Controller to act, and then we are told "Oh, that's just a flicker. You can't base moral responsibility on that."
Why the heck not?