They have been bullshitting us about this since the beginning. All they had to do to offer an alternative was let us run. They KNEW, they have a No Kill audience and addressed this several times, promising it was in the game.
Hell, in Deus Ex I ran from Walton Simons, Gunter and let Anna live on the Plane and the Train Platform just so I could use the Gas Grenade on her in the UNATCO office. It forces her to unlock the door, if you do it correctly. No Kills.