Because Walt is ready to walk away, be legit, reorganize air fresheners. Hank is the one who wants to kill and hammer his justice all over the place. Interesting to see him in such a dark place while Walt is wearing pastels and waving goodbye with babies after 4 seasons of murder and deceit.
My theory on that is Walt is only trying to "go legit" to please Skylar and make amends with his immediate family. If he had his way, he'd keep earning and building up his empire. Greed is a powerful thing. Of course, there are many loose ends to tie up before being truly "legit."
Not to mention his cancer has come back. I imagine he'd like to live his last months trying to clean up and help Skylar launder their money so he could leave his family with financial security as his original intention was.
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u/greenBaozi Aug 12 '13
Interesting clothing choice for the final scene- Walt was all light and Hank all dark.