Kelly Clarkson and LL Cool J have vented their fury at New York police after two officers were filmed forcefully shoving a 75-year-old peaceful protester to the ground.The incident involved members of the Buffalo Police Department, whose use of excessive force during Black Lives Matter demonstrations this week caused the elderly activist to stumble and hit the back of his head, leaving him with a bloody wound as other police officials, all wearing riot gear, walked by without offering their