Nothing Negan did justified having several hundred of his people murdered in cold blood because Rick and Alexandria literally voted that it's better them than us. Negan killed 2 people in retaliation and forced Alexandria into the very deal Rick committed mass murder to avoid. Poor decision making on Rick's part. Negan was merciful. If the show was intending to be in any way realistic, Negan would have massacred them all right there and then.
do YOU accept him?