They are Tribal just like the Tribal in NWFP of Pakistan.. the only difference is that they are well educated and much more well trained organised.
Now since they are educated they know what they are doing hence they keep the conflict to their area only and don't go rampage on some cricket team visiting the country/some naval base/some airforce base and production facility/some Islamabad hotel/some Peshawar market.
And as India has adressed there problems and have been providing them with better opportunities they have surrendered their arms in huge numbers.
Surrender
While those groups whose leaders didn't surrender and fled the country were brought to Justice.
Khawam kha diyan gallan ........ phuddu
Hey DARKY, go back to hell, cuz that is where you actually belong to.