I am of the opinion (however worthless to anyone else) that they got it dead wrong. God is an unnecessary concept. For all intents and purposes this "God" is not there - or if it is, does not want to be knowable so as to appear as if it isn't. Therefore it does not matter. To my mind, the "extermination of god", as you put it, has absolutely no consequences.
If you truly believe that people would go about the business of "doing whatever they want" to the tune of killing one another, raping, pillaging, destroying everything in a fit of wicked debauchery if/when they found out that there was no God, then you are discounting all of us who hold to a higher moral standard of our own (nurture/nature/culture/introspective/etc.) crafting who do not, and would not do those things. If you would only listen, we might teach you, so that you too could be a good person. As it stands, you admit that you are not, and that, like you believe others would, you would take up the torch and set the world alight if you found out God did not exist. Well guess what, friend? I'll be there on that day, alongside others like me, to stop you.