Rahul Gandhi’s answer to that question, given to American diplomats who seem to have his ear more than the people of India, was unequivocal: it’s the Hindu right whose violence he fears more. But fellow-Kafila-ite Subhash Gatade makes the point in an interview to Rediff.com that such violence is difficult to quantify and compare because it takes only a few from a community to perpetrate it:

…one sincerely feels that it is difficult to quantify the relative threats. Remember the period when India witnessed Khalistani terrorism, which involved a fraction of the misguided youth of the Sikh community and the danger it posed to peace and tranquility in the country then. [Link]

The interview discusses his new book, Godse’s Children: Hindutva Terror in India.