I mean if humanity is collectively held responsible for Bolivar Trask...although that's unfair to Bolivar who didn't intend to kill anyone originally, and when Bastion forced him back to life his reaction to learning how many people the Sentinels had killed was to immediately try and kill himself.
Apocalypse...well Age of Apocalypse didn't technically happen in 616, and he did't succeed in killing 90%of life on earth that one time in modern era...I think the biggest death toll would be Bronze Age Collapse then? So yeah Bishop's is higher.
Has anyone brought up Vulcan's time as an emperor?