Here's the problem though. What the fuck is Hank going to do? Ruin his family, his niece, nephew, sister-in-law and his own carrier just to get Heisenberg?
What's his alternative? Do nothing, and leave his sister-in-law, his niece, and his nephew unknowingly (he has no reason to assume Skyler knows) living with a meth kingpin who can be tied to a string of murders?
I think Hank directly referring to the people behind the prison murders as 'monsters' is important--Heisenberg, in his mind, is the worst of the worst. No way he leaves Holly, Jr., and Skyler with a monster just to protect his career.