The same reason Obama didn't get blamed for every civilian killed in day to day operations. This withdrawal on the other hand was personally initiated by Biden, he set the date, he took individual credit for precieved successes, and passed the buck on any failures, all the while telling the world the buck stopped at him. Totally different scenario.Correct me if my memory is failing, but I don't recall any of Biden's critics starting topics about these and wailing about Trump's incompetence.
Trump drone strikes mass murder Yemeni civilians: Hidden toll of US drone strikes in Yemen: Nearly a third of deaths are civilians, not al-Qaida
Trump drone strike murders 30 farmers: U.S. drone strike kills 30 pine nut farm workers in Afghanistan
Trump drone strike murders five innocents, including a new mother: U.S. Drone Killed Afghan Civilians, Officials Say (Published 2019)
Trump drone strike kills a mother and child: US acknowledges civilian deaths in Somalia drone strike