First of all thanks.
I disagree with the term 10%. During the 80's and 90's the percentage of people in Pakistan supporting jihadists was certainly very high (I would say nearly 50-70 % of "decision makers") for we were getting benefits.... support of GCC, fight against soviets, america was friendly and Pak Army was able to engage to indian army's 0.7 million army in Kashmir without spending a penny by sending jihadists...
The problem began in post Kargil and post 9/11 situation when the decision makers and like minded people of 80's and 90's tried to stop this dragon, they found that they could not control it.... add to it poverty, illiteracy, a whole generation fed with jehadist mentality, injustice at every level of society... and you get TTP and sectarian violence, and so on...
Now the %age of supporters is very minimal but the dragon is uncontrollable ...sad truth
First of all, that .7 million army in Kashmir is rubbish.
That apart, there are other reasons besides the 9/11 atmosphere that has led to the present situation. For one thing, the excellent border management done by the IA has ensured that only a minimal number of jihadis can cross into Indian territory. There is a three tiered electrical fencing, and sophisticated ground and UAV sensors that can detect most attempts at infiltration, especially of large groups. So at best, Pak can send in only a trickle of jihadis into India, and they are only going to get killed. The situation was different in the 90s when ISI succesfully diverted all the mujahideens from afgh into Indian Kashmir.
Secondly, we now have a fantastic counter insurgency grid in place there, who have complete area domination. The lightly armed but highly trained Rashtriya Rifles has inundated the whole place with some 65 battalions. They dominate every inch of the disputed territory. In the 90s, we did not have a dedicated counter insurgency force - today, we have the world's finest.
So jihading Kashmir succesfully is impossible for Pak based groups. Then of course, the inevitable blowback is occuring in Pakistan. All these frustrated jihadis, trained only for one thing but unable to do that to India, are doing it to their own state. The pakistani state has been found wanting, in trying to control the chimeras it created. For one thing, the jihadists are espousing the very ideals that many pakistanis want - islamic law of life, sharia etc. And as you can see on this very forum, many pakistanis do not mind the act, if it is done in pursuit of an end they think is justified. So terrorists throwing grenades into railway stations is halal, since it is done at the enemy. Most Indians would shudder to side with such terrorists even if they attack their enemy, but many pakistanis don't - that is also a contributing factor as to why Pak is now in the mess it finds itself in.