You believe the show is an exercise in justifying Walt's behavior? I find that absolutely bizarre. You are supposed to see Walt as a bad guy. The show is literally explaining why and how Walt has become bad.
...as i said in my original post, no main character on the show is wholly good or bad.
He's not completely bad. As evidenced by some of the things last night. But you have people thinking he was going to kill holly, these people are asleep at the wheel or just completely missing the complexities of the character.
Someone can be a bad guy and do good things, and conversely someone can be a good guy and do bad things. Nothing in this show is black and white, yet people are acting like it is.