If they say over scrubbing is bad for acne, why does ProActiv have those little sand things in them?

You would think that would aggrivate acne; anybody know why they have those then?If they say over scrubbing is bad for acne, why does ProActiv have those little sand things in them?
ProActiv encourages you to use the face wash that has granules in it for no longer than about 1 minute. One minute of face-washing is not ';over scrubbing.'; The granules are simply mechanisms that get inside your pores to clean from the inside out. Despite how they feel, the granules are a world away from washing with sandpaper. It takes more than soap and water to get out those pore-cloggers that refuse to budge -- you need those tiny granules. Trust me on this one.If they say over scrubbing is bad for acne, why does ProActiv have those little sand things in them?
for some people with sensitive skin...ProActiv should be your LAST choice!! I have sensitive skin, and developed a severe allergy to benzoyl peroxide after using proactiv. See your dermotologist..they can give you good info on what to use for your skin type.