"Harry Potter, outlaw and warrior, wasn't always the leader and founder of the revolution, he was once a child like any other" or was he like any other? Some would argue he was different from the start.
Voldemort looked upon his servant in disgust, not only had they let the boy escape him he had apparently broken into his most trusted servant's vault, he couldn't give the boy any time to plan, he needed to go check up on his Horcrux now, there would be no way for the boy to thwart him again.