Well all have it and no doubt part of the sin nature. It's take Jesus to fix everything. Even then while a person is saved they are still 'work in progress'. It's not until everything is said and done that a saved person can say they are 100% fixed(the new bodies/resurrection)
The resurrection of the Dead at Christ's second coming will be the permanent end to all sin nature and when all of us can look at each other without a single ill intention.
My take on what brain washing really is - It's the dark elements of a person's mind and soul they keep to themselves brought to the surface without any restraint.