While the country was being fed a candyfloss of Socialism, Panchasheel and Non-alignment, history was also being nicely abrogated to suit the interests of one party which usurped the freedom movement by its successor. Whether someone referred him as a 'War Criminal' is not the moot point (that by the by raises my angst about this whole topic) and here's why
The concept of pacifist freedom struggle and the belief that taking a slap on another cheek would win over the enemy ingrained in most of the Congress flock was a joke to Bose. He knew that the only realist way to kick the Britishers out was using force even if it meant collaborating with the Axis forces. Thus one saw Bose active in the pacific theater of war with his Indian National Army.
As Henri Louis Bergson puts it 'The present contains nothing more than the past, and what is found in the effect is already in the cause"