By Jonathan Allen ST. PAUL, Minn. (Reuters) -Three former Minneapolis police officers were found guilty on Thursday of depriving George Floyd of his rights by failing to give aid to the handcuffed Black man pinned beneath a colleague’s knee. The jury’s verdict against Tou Thao, 36; J. Alexander Kueng, 28; and Thomas Lane, 38, came in a case that hinged on when an officer has a duty to intervene in another’s misconduct. It is a rare instance of police officers being held criminally responsible for a colleague’s excessive force. Federal prosecutors argued in the U.S. District Court in St. Paul t…