This issue is just like any other "bad cop" scenario. The good cops have sacrificed their own reputation by allowing such abuse to go on unchallenged.
Yes, we all know that the majority are good. But those few bad ones stain the reputation of the whole, and especially so when the good ones do nothing to stop it.
They claim that this change will make it harder to do their jobs... well guess what, they should have thought of that when they were looking the other way all this time, and allowing these abuses to take place.
This falls squarely under
Blackstone's formulation, "It is better that ten guilty persons escape than that one innocent suffer."
Of course, these days it seems that some prosecutors have reversed that formula and would rather ten innocents be punished than one guilty person go free.
TFred