I just re-watched breaking bad and I really don't think the show justify at any point Walter actions.

From the beginning Walter has solutions, people offer him several ways. But he decline all of them because of his ego and turn more and more to criminality to satisfy his hunger for power.

Their is a harsh criticism of the US medical insurance system since every time someone need care in the show, either insurance decline coverage or provide a subpar one. But thats about it, Walter slow descent into a evil power junky is mostly describe as a result of his own character and decision. A simple chemical-teacher that missed his big break and live a fairly bland suburban life and finally get to break this and feed the frustration he had all along.