LONDON — In life, Hakimullah Mehsud, the leader of the Pakistani Taliban, was Public Enemy No. 1: a ruthless figure who devoted his career to bloodshed and mayhem, whom Pakistani pundits occasionally accused of being a pawn of Indian, or even American, intelligence.

But after his death, it seems, Pakistani hearts have grown fonder.

Since missiles fired by American drones killed Mr. Mehsud in his vehicle on Friday, Pakistan’s political leaders have reacted with unusual vehemence. The interior minister, Chaudhry Nisar Ali Khan, denounced the strike as sabotage of incipient government peace talks with the Taliban. Media commentators fulminated about American treachery. And the former cricket star Imran Khan, now a politician, renewed his threats to block NATO military supply lines through Khyber-Pakhtunkhwa — a province his Tehreek-e-Insaf party controls — with a parliamentary vote scheduled for Monday.

Virtually nobody openly welcomed the demise of Mr. Mehsud, who was responsible for the deaths of thousands of Pakistani civilians. To some American security analysts, the furious reaction was another sign of the perversity and ingratitude that they say have scarred Pakistan’s relationship with the United States.

“It’s another stab in the back,” said Bill Roggio, whose website, the Long War Journal, monitors drone strikes. “Even those of us who watch Pakistan closely don’t know where they stand anymore. It’s such a double game.”