It has been discussed countless times here. Yet for you, one more time, I will give the reasons.
1. The influx of refugees, 10 million is conservative figures is a reason in itself for India to take action.
2. Boss, Pakistan showed the way some 6 years back, in 1965, when Papa Bhutto came up with his astoundingly ambitious and stupid plan of pushing army regulars/armed civilians under the guise of 'mujahideen' into Kashmir. The plan failed and the rest is history. Now, tell me, why are you complaining now that someone gave you a dosage of your own medicine ? Isn't that expected ? You throw a stone at someone and he will throw a stone back at you. If that person is bigger than you, then there is a high possibility he will throw a bigger stone at you. It's not like that the onus is on India only.
The only difference is Pakistan's attempt failed while India's was a success.
Musharraf was stupid enough to repeat the same scheme after 30 years when India grew to be an even bigger power. He thought the nuclear umbrella is going to save him. He was wrong and now he has blood of 4000 good men in his hand with nothing, absolutely nothing to brag about.
3. This, not accounting for what Pakistani army did in East Bengal. Otherwise the atrocities committed and the human rights violation there are a reason in itself.
@KURUMAYA If it has to be fair, then it has to be proper. We can't put blankets over one part and talk about the other.
Aapke previous leaders, woh logon ne yeh sab kaam karke rakhhha hai pehle se..so you can't complain if there is a knee jerk reaction. And you don't know when the reaction is going to be.