Napoleon was 'always brutal'? Could you please explain that sweeping statement?
Further, where was the 'brutality' in Pavia? There was a revolt and it was put down and about 80 rebels were killed in the ensuing fighting. There were also court-martials and rebel leaders were subsequently shot. See The Road to Rivoli by Martin Boycott-Brown, pages 338-348.
How would you expect a revolt to be suppressed or put down?