it's a weird thing, because as we've so gradually taken the journey with walt from square one when he learned about his cancer and went through the levels of justification for what he was doing, it's easy to trace that back to its roots and say that the good intentions somehow make what he's done or is doing less severe. this is the part of the story that you would never get on the evening news: we've seen him genuinely love his son, go out of his way and self-sacrifice to leave this nest-egg for his family, seen him struggle with what he's doing emotionally, and as such when skylar wigs out on him it's easy to say, "god, poor walt, he's just trying to take care of you and you're throwing it in his face."
but that's the beauty and the trick of a show like this, where we have the time to gradually take those steps with a character. because it seems so gradual, i find myself buying into walt's justifications one-by-one, until i realize i'm as knee deep in shit as he is, and only thinking objectively can i lift a foot out and realize what i'm standing in. skylar is far from perfect, this is true--but she's not evil for freaking out at the notion that her husband is a meth cook, or even for freaking out when she realizes that walt has had a secret life for a good long while. that sort of secret is a betrayal which really cannot be undone.
there are no heroes on the show, only victims. collateral damage like walt junior are the ones we should be focusing on. i feel similarly about jesse, as despite the fact that he got himself into much of his own mess, it's clear that his decisions have been influenced by a weakness for narcotics that severely impaired his judgment and led to him fucking himself up very early in life.
so yeah. it's easy to make justifications for walt, because we know where he's coming from. but where he's ended up is as a person who's done some pretty dastardly things, and willfully made a lot of innocent people collateral damage in the interest of making his family financially comfy.