That's similar to the argument I've heard from black "leaders" that because of what they've done in the past to black people, evil whitey deserves what he gets now at the hands of black thugs.
Both arguments are specious. If these cops are guilty, then they should be found guilty and punished. But we try to preserve the semblance of law and not predetermine guilt or innocence.
Go back and read the statement again. Note that it primarily deals with the prosecutor...and the police.
Do the specific individuals in question "deserve" it? Hard to say. Their history is unknown in that detail...yet.
But the point is a generic one, and it has been written about in depth over the last 30 years. The law is routinely abused now by overcharging, "novel" legal theories to make charges, and thin justification for Draconian responses.
You say "If these cops are guilty, then they should be found guilty and punished" - but would they even have been charged if other events weren't in the news?
And now people are upset about them being overcharged?
The hypocrisy and irony that I am pointing out is this: the Prosecutors and Police routinely use this as a technique to ensure that at least one charge sticks. If you hit them with 5 charges, a defendant's attorney will come in and make a deal to plead to the lightest one.
They know that. So that's why they do it. It's a game.
And that game is "make sure we have a good conviction rate or else my next review won't go so well".
Has nothing to do with "justice" or any other high minded crap like that. It's a metric for a job.
But it's a dangerous game because a) one day there will be blowback and b) it could be used on you. So don't be cynical and play games with people's lives. Play it straight up.