According to the IG report, this is one of the tactics we used.
It will obviously take a determined and excruciating effort to root out the rot that the Bush-era torture policies fostered. And there will be many, many voices trying to fight it. Most will claim any investigation will be merely political, although this is really laughable as many of these same people supported very political investigations during the Bush years.
In any case, there are some very important principles at stake here, and winning this battle is far from certain. But losing the battle for accountability risks very deep, profound and long-lasting (generational) damage to America. If only a few privates, sergeants, contractors and field agents are punished for this betrayal of American values then those values will have been proven hollow and meaningless for all the world to see.