Sana, Yemen

“DEAR OBAMA, when a U.S. drone missile kills a child in Yemen, the father will go to war with you, guaranteed. Nothing to do with Al Qaeda,” a Yemeni lawyer warned on Twitter last month. President Obama should keep this message in mind before ordering more drone strikes like Wednesday’s, which local officials say killed 27 people, or the May 15 strike that killed at least eight Yemeni civilians.

Drone strikes are causing more and more Yemenis to hate America and join radical militants; they are not driven by ideology but rather by a sense of revenge and despair. Robert Grenier, the former head of the C.I.A.’s counterterrorism center, has warned that the American drone program in Yemen risks turning the country into a safe haven for Al Qaeda like the tribal areas of Pakistan — “the Arabian equivalent of Waziristan.”

Anti-Americanism is far less prevalent in Yemen than in Pakistan. But rather than winning the hearts and minds of Yemeni civilians, America is alienating them by killing their relatives and friends. Indeed, the drone program is leading to the Talibanization of vast tribal areas and the radicalization of people who could otherwise be America’s allies in the fight against terrorism in Yemen.

The first known drone strike in Yemen to be authorized by Mr. Obama, in late 2009, left 14 women and 21 children dead in the southern town of al-Majala, according to a parliamentary report. Only one of the dozens killed was identified as having strong Qaeda connections.