D.A.s are just as bad as police officers when it comes to selective enforcement and application of the law

That's because they ARE cops. They weren't originally supposed to be, but they do the exact same thing as cops do: put as many people behind bars or to death as they possibly can regardless of whether or not they're guilty.

Just like cops will get funding based on their "solve rate" whether or not they actually got the real culprit every or even MOST times, DAs run for re-election based on their conviction rate, no matter how many miscarriages of justice are counted amongst those "wins'