I don't think Pakistani establishment would do something as stupid as this, will give them more bad press (like they need more)
Even if Pakistan decides to hang Sarabjeet, although unfortunate for his family, but it will still work for India's case.
Think about it, Pakistan hanging an Indian prisoner who has been in jail for quarter of a century, right after India hanged a Pakistani terrorist, whose heinous crime mind you was caught on the CCTV and is there for the world to see.. The very terrorist who Pakistan and Pakistanis have been vehemently claiming as not one of their own. Will give more credence to the terrorist sympathizer/supporter tag.
Even if Pakistan decides to hang Sarabjeet, although unfortunate for his family, but it will still work for India's case.
Think about it, Pakistan hanging an Indian prisoner who has been in jail for quarter of a century, right after India hanged a Pakistani terrorist, whose heinous crime mind you was caught on the CCTV and is there for the world to see.. The very terrorist who Pakistan and Pakistanis have been vehemently claiming as not one of their own. Will give more credence to the terrorist sympathizer/supporter tag.