That's your patronizing idea about adivasis, that they are primitive forest dwellers with stone tools. "Adivasi" simply means aborigines, and in India, some of these people populated India long before Indo-Aryans or Dravidians did, hence the term "Adivasi" (First inhabitant) for them.
But that does not mean that a boy or girl from an adivasi community cannot learn to shoot with a rifle, or learn guerilla warfare. They have the same mental and physical capabilities as anybody else. They too can adapt and change with the times.
Andrew Symonds is an Australian "Adivasi" - or what they call "aborigine", which means exactly the same thing. That doesn't mean he paints his face and chases kangaroos with spears for a living.
Yes they do all that, but despite all that, they are Indian citizens. It's a fact. "Indian citizen" is not a compliment or rebuke - it is just a factual matter. Citizenship does not mean goodness. Even if they commit terrorism, extort businesses, kill our security forces etc, they are Indian citizens. Just like the TTP fellows are Pakistani citizens, although they kill Pakistani forces.
The army has always been of the opinion that they should not be deployed in the heartland against insurgencies. It is not simply the opinion of a general who has turned politician. Not just the army, but the forces that are presently fighting the naxals are also of the same opinion. Did you see any of the injured policemen on TV say "Please, we don't want to fight anymore, let the army do it"?
@vk17 is one of the people fighting the Maoists, let's hear his opinion on this.