They weren't indicted or roughed up because when asked nicely, they returned said documents or offered explanations for why they were taken.Of course he is guilty, just as Pence, Biden, Obama, Hillary, and others were guilty. But they weren't indicted. In fact, Hillary's carelessness could have been hacked by any of our enemies around the world and yet Comey said that even though she was extremely reckless and careless and knew what she did was wrong and yet did it anyway, no reasonable prosecutor would prosecute the case against her. And yet Biden's DOJ doesn't mind prosecuting Trump.
Trump did none of those things. Worse, he tried to obstruct the efforts to retrieve those documents. That's why he's being prosecuted...not persecuted.