i have to say of the VERY little of the video that I\'ve seen it looks to be clear cut case of brutality. I don\'t know what he was being arrested for, or how he was first aprehended, but it could be a case of "chase anxiety", where the officers body becomes excited during a chase, triggers the flight or fight responce, and they temporarily lose their senses.
As for the testicle grabbing, and resistense....this is pretty weak. with the number of officers their, and suspect in cuffs it was basicaly a code 4. Deffinetly no way for him to escape, or endanger anyone in vacinity, thus no reason to use violence to subdue the suspect.