The author has left out various other factors: 1. Many tribals/villagers live in fear of the naxalites. 2. As someone mentioned, many of these Naxalites are goondas as well. And they force locals to fund them. 3. Many receive support elsewhere.. there may be foreign funders out to subvert the nation -- ISI, commies, Christian missionaries.
4. What do the naxalites ultimately plan to achieve. Why can't they fight through the ballot box instead of using bullets.