They were a victim of addiction, it looks like. Imagine how bad they must have felt knowing that their addiction came before their kids. I don't blame people like this, I mourn for them. A puritanical approach to these types of deaths does nothing to solve the problem of addiction or substance abuse. If anything it shoves the problem further under ground, fencing off those who would seek treatment because of the moral outage associated with admitting that they have a problem.