In the last season Walter gets pissed when Saul suggests whacking Hank because he knows he's Heisenberg.
It's like.. who did Walter actually care about on the show besides his two kids and Jesse? He didn't even give a fuck about Jesse's girlfriend, or two innocent children.. one he poisoned by his own hand.
He comes full on evil, and yet he see's Hank as family? That guy kinda teases Walt relentlessly, always alphaing him in some way, and he didn't even give a shit about his wife that much. He just wanted to be with his kids.
So Walter kills a bunch of people to get where he is but the last one guy who can stop him? Nope