The soundtrack, and the voices of the British soldiers on it, were self-evidently sadistic. Moreover, they weren’t just violent; they sounded as if they were enjoying it. The unseen soldier sounded to be getting a thrill out of humiliating his helpless captives. This was his way to have fun. It sounded to me as if he’d be replaying the scene over and over again in his mind, to get every little bit of pleasure back again. Replaying it over and over, faster and faster, in his own private time.
Or maybe that’s just my own interpretation of it. Getting pleasure from people like that without their own agreement is always wrong, whether you enjoy it or not.