Answers to your question why India is reluctant to talk to Pakistani rulers are contained in some of my articles see for example
and articles by many Pakistani writers. See for example
Real question which puzzles people and where the answer lies is
Why are many terrorists roaming freely in Pakistan? Main reason is army top and feudal lords in Pakistan are ruling Pakistan since independence. They feel insecure. They are using part of this terrorist network with such slogans "crush India", "USA is biggest villain", "Muslims are in danger" "Kashmir is ours" "death to Israelis" etc. to keep population misguided and are giving color of Muslim religion to their activities to win support and for keeping intact their rule in Pakistan and dreams of power in many parts of world.
How can you expect any country to be talking to Pakistani political top which consists of mainly such army top and feudal lords. Not just India almost no country takes them seriously.
You may have feeling that USA, UK just now have all praise of this Pakistani top. They are doing it only because they themselves are lost in a quagmire in af-pak war where they do not know what to do and seem to be fighting from both sides etc.
They are just hoping that with these soft words Pakistani top may get away from its self destructive path, which creates safety hazard for whole world. Even India is interested in the same. Nobody is interested in increasing miseries of Pakistani people unleashed due to bad policies of their ruling top.
Many Pakistani writers, movie actors etc. visit India often and are respected in India. In India people do not distinguish much between population in India and Pakistan. They are anyway same. It is only this ruling top with which India wants to be careful and it is not just India every country in world (including those in Pakistan who understand this game being played ) feel the same.