You are being grossly unfair.
Josh Uretsky worked for Sanders only since September, and he is well connected. He's a smart guy, too, very smart.
He was in charge of the dept, and it was his responsibility to keep things on the up and up. He engaged in what is called "white hat" intruding: Deliberately commiting a misdeed for the greater good, over a period of 40 minutes.
Should he have been fired? In a normal world, no. But he said he didn't expect the DNC to react the way it did.
The DNC--my thought--reacted like complete a-holes, period, and Wasserman Schultz, a known Clinton supporter, was looking for a scandal and for blood. Don't kid yourself that she wasn't.
So yes, because of the way the DNC reacted, Josh should have been fired. Josh knows it, Bernie knows it.
In a court of law, Josh would have to admit that he committed a misdeed, a fireable offense in the workplace. He was in charge; he is a seasoned professional in this field.
I have no proof to back this up, but I firmly believe that Josh will have no trouble getting another job somewhere else, and his previous employer will give him glowing praise.