I have read books recently as noted thoughnot on Indian politics. But I do know the BJP are a nasty bunch who love to stir up sectarian hatred and riots. If I missed sometging redeeming about them please advise.
I don't think you qualify as knowing things on this really. Indian politics is complex and not exactly filled with great alternatives.
I guess most importantly, the BJP has been in power fairly recently. There was no genocide or nuclear war or whatever. Just one of the strongest eras of economic growth in Indian history. That isn't to say there are a lot of serious issues with the BJP and Modi, because there are, but comparing them to Golden Dawn is totally ridiculous.
I'd say they're fairly comparable to the Republicans and plenty of their voters are analogous to someone like Torie (or any other moderate Republican of your choice).