For Bose, fascism was a technique of political organization, and a diagram for relations between government and society. Bose was not a democrat. He may have been one in the 1920's, but by the late 1930's he was quite certain that parliamentary democracy was not suitable for India. In his mind, India needed firm control by a single party, which would direct every aspect of social, political, economic and even personal life.
He believed that India's problems - such as caste discrimination, class injustice, the need for economic modernization, etc. - were so deep-rooted that mey could only be weeded out through massive state intervention. For this, Bose believed, the machinery of the state had to be in the hands of a single, powerful, reforming party organization, such as the Nazi Party in Germany or the Communist Party in the Soviet Union. At this point, he still believed that this party would be the Congress.
Also, although India was clearly on its way to independence by the mid-40's, this was not the kind of independence that Bose had wanted. For Bose, the revolution at home was as important as throwing out the British, and for this he needed to be completely in charge. He did not believe that the replacement of British rule by a conservative parliamentary democracy would not bring about fundamental changes in the structure of Indian society.
This brings us some of the most basic questions about Bose, the nationalist and the politician. What are we to make of the fact that he wanted to invite the Germans and the Japanese to invade India? And how do we reconcile his heroic status with the fact that he aligned himself with Nazi Germany, and that he openly advocated dictatorship as the best form of government for India?
Perhaps the biggest weakness in Bose's plan was his belief that even after bringing the Japanese into India, he could maintain effective control of the country. At a diplomatic level, he had grounds for believing he could pull this off. He refused to take India into the Japanese Co-Prosperity Sphere, which was the euphemism the Japanese used for their new empire in Asia, The Japanese accepted Bose's decision on this. Still, if the invasion of India had succeeded, it is difficult to see how he could have remained fully independent of Japanese control.
Bose felt that since the people of India would be with him, he would be able to resist Japanese demands. He knew that India was a long way from Japan, and that the Japanese were already at the limits of their capabilities. He also pointed out that the American revolutionaries had accepted assistance from France, and this didn't make the US a French colony. He may have had a point. But this analogy has its limits. Given the fact the INA was completely dependent on Japan for arms and ammunition, and that it would take time to develop an industrial infrastructure in India, Japan would probably have had a lot of leverage.
There is no getting away from the fact that Bose deliberately ignored the moral evil that Nazi Germany represented. He had lived in Germany for much of the 1930s and the early 40s. He must have known something of what was going on. He had the courage to speak out against some of the racist aspects of the Nazi ideology, and even speak his mind to Hitler himself. But he was not sufficiently disturbed by Nazism to reject Hitler's help. Similarly, his alliance with Japan ignored the atrocities that the Japanese had perpetrated against people in the countries they had occupied.
Unlike Gandhi and Nehru, Bose believed that the end justified the means. He wanted freedom for India, and to some extent, he didn't care who he had to approach for assistance. But this explanation, I think, is too kind to Bose. At some basic level, Bose had an ideological affinity for fascism, and he was a little too comfortable with using the state to crush dissent and ideological diversity.
Indians who refused to believe that Bose was dead, and who continued to believe for decades that he was alive somewhere in the Soviet Union, hoped he would just surface again some day like a messiah, and solve all of India's problems. Yet these people misunderstand Bose, and what he stood for. Had the INA and Bose succeeded on the battlefield, a free India would have been a totalitarian society.
Bose was passionate in his patriotism, and genuinely well-intentioned. He was genuine in his desire to help the disadvantaged segments of Indian society. But good intentions are not enough. Some of the greatest tyrants of the 20th century had good intentions: Lenin, Mao, Pol Pot. (You'll notice that these are all tyrants of the left. Tyrants of the right like Hitler, Franco, or the Shah of Iran, don't get credit for good intentions.)
Bose didn't seem to realize that the methods you choose do matter in the final analysis. Totalitarian institutions inevitably corrupt even the best-intentioned people. Even if it hadn't corrupted Bose himself, even if he had remained a so-called benevolent dictator, there would have been no guarantees that his successor would have been benevolent.