The Iran gas issue is not so simple for any Indian government.Both the communists which support the government & the centre-right hindu nationalist BJP,are calling for India to reject US demands to shelve the pipeline.So the domestic compulsions are very overwhelming.The economic ones are no less simple-India needs cheap energy & the nuclear deal will take almost a decade to reap fruit on the ground,unlike what some airheads over here rant.The other gas options for India are Qatar, Burma,Bangladesh & Indonesia-all more or less as stable/unstable as Iran is.
In a decade of paying tribute to the Pakistani army to “guard” your gas pipeline, you will have paid them over 6 billion dollars.