Nice try, Uncle Mxy, but what's the difference between the gun fingerprints being smeared by hitting Superman vs hitting anything else including the ground? Real police easily handle guns without destroying evidence. Surely the Man of Steel could be at least as capable?
A capable Superman would not make for very good TV. "See the red and blue blur? That was Superman!" There's more likely to be finger print oils absorbed by his clothing, or generated by his hands, than if he just leaves the guns alone and ducks.
I chalk this one up to the real world production having a gaffe in portraying such an encounter. We had a similar one in Superman II when Jack O'Halloran, playing Non, stumbled and nearly lost his balance when trashing the Daily Planet newsroom.
He was still having trouble adjusting to Earth's lower gravity and the powers he has under it. Obviously, he was struggling with heat vision for a bit there, so this isn't too much of a stretch.