Internal security threats to India?

Happy Republic Day to all ! on this 60th Republic day, what do u think are the biggest internal/domestic security threats to the integrity and continuity of India as a nation? Is it Muslims, Maoists, or corrupt elites? remember, the internal threats to India have always been more than the external ones, and always more vicious.
the nation has always been undone by its internal squabbles, with external parties merely taking advantage of these fights. it seems Indians always hate each other more than they dislike foreigners, and therein lies the reason for 1000yrs of external colonization. when will ppl wake up, when will the innate nature of so many ppl change? until the mentality changes, external control is always a possibility...