It's not about base desires, it's that some people are simply assholes. No amount of training will overcome someone's asshole nature.
There is a prevalent and totally erroneous school of thought which naively assumes that people do bad things simply because they don't know any better, and so all you have to do is take them aside as you would a misbehaving kindergartener for some "training" and then all will be well. It doesn't work that way. Some people are just assholes and always will be, irrespective of any amount of "training" you give them.
I don't think that school of thought is actually prevelant. They make you go to training classes so if there is a lawsuit they can point to all the training and say it's the individual's fault, not the company's.
There is a prevalent and totally erroneous school of thought which naively assumes that people do bad things simply because they don't know any better, and so all you have to do is take them aside as you would a misbehaving kindergartener for some "training" and then all will be well. It doesn't work that way. Some people are just assholes and always will be, irrespective of any amount of "training" you give them.