collapse of the old society

And that's the "no ethical consumption under capitalism" issue. Sure, you need a house to live in, and goods to purchase, and places to buy those goods (ie, malls and other commercial stuff). But how can you absolve yourself from blame for purchasing necessities and not offer that same grace to the companies that produce those necessities for you?

Pointing fingers and placing blame is a distraction. The right thing to do is for you to reduce your environmental impact where you can, purchase goods from the least bad producers, and encourage others to do the same.