“By now Walt is pretty solidly 100% evil.”
This never entered my mind. For me he is 25% evil and most of his killings were justified. Most or all were tying up loose ends. So either Walt killed person X or person X would kill Walt first or squeal to law enforcement.
He has two inexcusable kills: letting Jane die (which of course lead to many more deaths), and letting Todd kill the kid during the train robbery. Neither of those was kill or be killed, the kid might have presented a problem but probably not (kids are cheap to bribe, and who’s going to believe them).
And even some of the folks inside the business were borderline. He didn’t have to kill Mike or his crew. He didn’t have to kill Gale and more importantly he didn’t have to force Jesse to kill Gale. All the battling with Gus (with all the deaths) was purely Walt’s fault.
Then of course there’s the non-deaths. The vast array of lies and manipulations. The non-lethal poisoning of Brock. Walt’s just a scumbag now. He sees the world as tools and obstacles, classic sociopath. He started off trying to make enough money to keep his family well, but the ego got in the way, he decided he wanted an empire. That’s when he became 100% evil.