How come? They'll be biased too, that's why you should check some neutral source
How about the battle of 1971, in which all Pakistanis claim had been instigated by India.
TIME magazine provides a very detailed account of that time, btw in 1971 the USS Enterprise entered the Bay of Bengal to threaten us, so the article definitely isn't Indian propaganda
Everyone's biased including you and me, you mentioned India's has never invaded another country but we can go on about the border skirmishes in 67 and who's fault it was that the first incursion was made etc. Point here is no one can say for certain if history will always hold true for a countries future actions. And Pakistan has not used its Nuclear weapons or missiles in any aggressive manner so who's to say they can't be non aggressors too?
No Pak did not, read about AQ Khan who got the know how from China and North Korea
This link has a brief summary of the history of Pakistan Nuclear program, AQ Khan it seems already had great deal of knowledge about creating nuclear devices when he came into the picture. Similarly we can also debate if China would have helped Pakistan if India didn't herself pursue a nuclear weapon.
Pakistan Nuclear Weapons
Ultimately all is fair in War US chooses to arm India similarity to how China chooses to arm Pakistan. Least with Nukes all round diplomacy is now the first choice in conflict negotiations because the alternative would be an endgame for all.