I don't think we should "dismantle our civilization" by any means, and those who would advocate for such things are seriously delusional and far out on the fringes.
The reason I say this is the silliest debate we can have is this: Let's just assume for a moment, like you did, that the answer to the big MMGW question is that it does exist. What would we do? Well, try to make our transportation more efficient, reducing consumption of fossil fuels and lowering our dependence on foreign oil, improving national security... Wait, what was bad about that again?
Should we "dismantle civilization"? No. Should every soccer mom have a giant SUV that not only guzzles gas, it's too big for her to handle safely? No. Should the government dictate that choice? No... But they could impose some sort of financial penalty (big gas tax, vehicle sales tax by weight, etc) to encourage those who don't need such vehicles to look in a more efficient direction. (This is already done to some extent.) Ideal solutions? No, but when is a solution ever ideal?
The big problem is that there's no middle in politics any more. Do we have too many oversized or inefficient vehicles on the road? Right now one side might say "Ban them all!" while the other side says "Screw you, it's a free country and I can do what I want!" A middle ground that makes sense would be more like: Well, let's add on a higher gas tax and use the money to fund more R&D for fuel-efficient vehicles or infrastructure for alternative fuels.
Shut down factories? Well, we still need to make stuff, and our current problem is that for every factory that gets shut down in the US, another one opens in China or some other country that has very lax environmental policies and is probably dirtier than the factory in the US was, plus you add on the environmental cost of transportation halfway around the world, making it a BIG loss for the world environment if we shut factories down here. So, how about we try our best to keep our own factories open, and since that alone should provide increased tax revenue, it makes sense to invest some money in keeping them both open AND as clean as possible.
I guess that maybe just makes too much sense, so instead we spend tons of money on an argument, nothing ever changes, and we simply **** away that money without accomplishing anything. And that's how things will be until we get our heads out of our asses, stop pointing at each other and yelling, and agree that we can improve things more effectively if we can come to a compromise that allows us to work together.