i think it’s a lot to stomach, and can make you feel incredibly guilty if you identify with this culture in the way that most people do. like DJ says, if you believe that your sustenance, your life is dependent on food from the supermarket, then you will do everything you can to defend it from any attacks because as far as you know, that super market is your life and the life of your loved ones. if someone comes along and attacks it (either verbally or physically) you will do what you can to defend it because to you that attack is a personal offense, it threatens your vary life.
the movie does a great job of defining exactly what civilization is doing to the planet, but if you identify with civ like most people do, it comes accross as an accusation. and who wants to admit to raping and destroying the planet? i think it’s a very logical reaction to get up and walk away if you think someone is accusing you of crimes as extreme as that.
to me the movie really revealed how much this culture is a culture of denial because of the way my family reacted to it. i think most people (at least to some extent) realize what they are taking part in, but the guilt is too overwhelming and makes them want to turn a blind eye and look away. it’s too much for most people to stomach. and when they can’t avoid it, they go on the defensive as if they’re being attacked because they’re civ bubble is in danger of being popped.