What the Home Affairs Minister really enjoys is power — what George Orwell once described as the image of a boot crashing down on a human face. He exults in trampling his opponents, leaving them defeated and demoralised. He gets his kicks not so much from tormenting them, but from crushing them into impotent misery.
Thus the brutality of his treatment of the Sri Lankan asylum seekers is almost incidental. What matters is his demonstration of supremacy — his ability to override all the normal standards of decent behaviour just because he can