1.Hitler also came through a seemingly democratic process. He was on Time cover once. Churchill, Attlee and Western leaders were quite appealing with him, acceding to his demands one after the other.
2. Those who think they have catapulted Modi into power to tackle a rising China,need to remember the fate of those who had accepted Hitler's rise as a shield against the Bolshevik revolution.
1) Hitler was a vegetarian, and so is Modi. Oh, noes! So obviously Modi is another Hitler! Hitler did not have children, and neither does Modi. So obviously Modi is another Hitler! Hitler used to drink water, and so does Modi. So obviously Modi is another Hitler! Hitler was shorter than most of his countrymen, and so is Modi. So obviously Modi is another Hitler! Hitler had facial hair, and so does Modi. So obviusly Modi is another Hitler!
There are many more such similarities between them, I'm surprised you forgot to mention those. I mean of course, everybody who has been on 'Time' cover would become another Hitler, anybody who is well liked by other leaders would become another Hitler, and similarly anybody who is a vegetarian would become another Hitler.
2) Nobody did. Indians elected him for the excellent governance and development he did in his home state, and his promise to do the same on a national level.