Hindutva as defined by Savarkar baguely means Indian nationalism that draws its inspiration from Hindu Maratha culture It ca nt be called Hindu extremism is broadest sense largely since Hindu fundamentalism is an oxymoron moreover founding fathers of Hindutva were Agnostic Hindus Hindutva rose as a complementary movement to Marathi cultural resurgence all founders were Marathis specifically Marathas and Konkanastha Brahmins and till 1970 s most memebers of RSS were Marathis Hindutva in these days is a vague ideology It differs from one propounded by Savarkar to the one practised by parties like Shiv Sena and Bajrang Dal BTW I was an active HSS member till about 2003 before i left Hindutva for good