The point is about immi's hypocrisy. Last I heard Taseer is not proposing shariah or surrender to talibs.
There is a difference in Imran Khan and Salman Taseer. Imran Khan was a playboy and drinker as cricketer. But it changed when he got married, and now that he is in politics he is not the same i.e. he does not drink/sleep-around. So if he asks for Sharia I don't think there is a problem. However if someone is a drinker now and drinks against current laws of Pakistan then that should be considered a problem regardless of how easily it flows in the society.