User blog comment:Keekian/Doflamingo not caring about his crew's lives/@comment-24769684-20161017170254/@comment-3507581-20161018144840

Well put, Kaido-san.

To reinforce this, the entry of "Complete Monster" about One Piece in TV Tropes states that he would use the Birdcage to kill everyone, even if it means offing his own "family" as well and starting a new one. What would else we expect from someone who comes from the very tyrants who founded the most nefarious dictatorship in the world of One Piece?