Yeah he killed Abraham and Glenn, when he HAD to. About 100 of his men got killed and he only killed 2 guys.
He rewarded Daryl after hitting him to invite him into his A-Team. He then invited Eugene after he built a bullet to kill him. Now, he's invited Sasha after she tried to assassinate him. Rosita shot at him and he just got someone else to deal with it. He has a lemonade after Carl threatens to kill him.
He does his best to help Rick keep his leadership position.
I mean, if Negan was to get anally assaulted, he would probably give you a medal.
He wants to recruit fighters/survivors not sheep. All your examples are of people who showed backbone and that is what he prizes.