Militarily speaking, yes Pakistan should be wary of Indian deployments and build up their forces accordingly. I guess they are doing that as much as possible, and am sure the Pakistani Army is professional enough to know about its operational capabilities and weaknesses.
But as for India, India is deployed not as an offensive force, but as a defensive force. Please tell me has India ever ATTACKED Pakistan leading to one of the 4 wars our countries have fought? India has never and India never will. India has dedicated so many forces against Pakistan including their aggressive posturing in Siachen etc., because they do not trust Pakistan. We believe that the moment there is a lapse in security or the moment there is demilitarization, we might suffer what we suffered in 1965, 71 or 1999. We might be pushed into a major war. We dont have anything to look back at that gives us the confidence that Pakistan wont pull one of its stinkers. On the other hand, Pakistan has only its own actions to criticize, for what happened in the past. That is why Indian apprehension (threat perception) has more credibility than Pakistani apprehension, because your fear is baseless. Our fear has reason.
What you state is a standard Indian response.
Let me respond with the facts.
1948
Yes, India invaded Indian Occupied Kashmir first. The Indian invasion of IOK started much earlier than the Pathan intrusion and Pakistan Army’s involvement. It was all started by and planned in meetings between rulers of Alwar, Kapurthala and Patiala etc with Maharaja of Kashmir with complete knowledge of Indian Hindu political leaders and their supporters in Indian government.
Many of us do not even know that after the pogrom in Punjab where Muslims were killed in millions in order to ethnically cleanse the areas and change the demography, where did these marauding Hindu and Sikh hordes were sent to? Indians wouldn’t know or probably wouldn’t want to acknowledge it – these hordes were sent to Jammu to loot, rape, abduct and kill Muslims.
As planned, in the initial instance, they intended to ethnically cleanse areas of Jammu where Muslims were in minority. Between July and October 47, over 500,000 Muslims were thrown out of their homes, out of which 200,000 thousand were killed and about 300,000 were forced to emigrate to Pakistan. This was the first stage of this operation. The Pathans came to safeguard the Muslims from hordes of marauding Sikhs and fundamentalist Hindus and Pakistan Army moved in later when Indian Army had already invaded IOK.
1965
Yes you attacked Pakistan in 1965 war. Indian Occupied Kashmir is a disputed territory and is not part of India. The military action was taking place in IOK. India attacked mainland Pakistan. India is the aggressor.
1971
Yes you invaded east Pakistan first. Is there any doubt about it. I don't think so.
1972
Attacked in Chorbatla AJK.
1982
Indian Army invaded and occupied a portion of Siachen. Indian Army Northern Command Command accepted that India invaded occupied Siachen on a perception that Pakistan may occupy it. He accepted that it was without provocation.
Let me also highlight your so-called peaceful, non threat posing and non-hegemonic regional approach as well.
India invaded and captured Junagarh and Manavadar in 1947, invaded and captured Indian Occupied Kashmir in 1947, invaded and captured Hyderabad in 1948, invaded and captured Goa in 1961 which was an area belonging to Portugal, invaded East Pakistan in 1971, captured certain locations in Chorbatla in Kashmir in 1972, invaded and captured Sikkim as late as 1975, invaded and captured some portions of Siachen in 1984, captured certain locations in Qamar Sector in Kashmir in 1988, created Sri Lankan terrorist group LTTE and later invaded Sri Lanka in 1988 till the President of Sri Lanka had to openly ask the Indians to leave, invaded Maldives in 1988 and has continually interfered in internal affairs of Nepal and Bhutan and has spread state sponsored terrorism in all her neighbouring states including Pakistan.