No..... We had better hang on to the old way. I see what you are saying though. It's like Al Capone. Everyone knew he was guilty, but they couldn't pin anything on him until Elliot Ness finally pinned tax evasion (I think it was) on him.
But no, we cannot assume anyone is guilty until there is proof. Look at the trial of Jesus. They crucified him without proof! They were actually just jealous of him, and didn't like him telling the truth about them, or disappointed, or something. So even though we have our Al Capones, we still need PROOF.