By Daphne Psaledakis and Trevor Hunnicutt WASHINGTON (Reuters) – U.S. President Joe Biden said on Sunday that police officers must deliver both effective crime deterrence and equal justice in a message that balanced two fraught political priorities as his law-enforcement reforms have stalled. Speaking at a memorial service at the U.S. Capitol for 563 officers who died in the line of duty over the prior year, Biden offered no new indications over how he would resolve a delay in police reform aimed at holding officers to a higher standard after high-profile killings of unarmed Black people. Inst…