There's also the little detail about how some people will not change their minds on some of their opinions unless they are tortured or their wills are worn down and forced to do so against their will. Someone who is intent on being evil and would normally not change their mind no matter how many normal conversations you had with them is being brainwashed by this method into accepting something they would ordinarily never accept. This is a key distinction. If a person is the slightest bit open to redemption, then yeah, you don't need brainwashing. You wouldn't need control or the will saves either, because progress could be made in time. The fact that this can affect people who would be evil to their dying breath means this remains firmly within brainwashing territory.