My logic is based on numbers. Earth Population, Imaginary lines in the sand, War over money. These are not signs of intelligence, especially when they have only 1 planet to survive on that gets more populated every day with little regard to long-term resource management, although I am proud of the Svalbard Global Seed Vault. :)
This type of planning worked for Voyager (NASA/JPL).
fyi: cars suck. Dirty, inefficient, and it follows the same logic of giving every person in a 200 person hotel an individual elevator. It makes no sense, when you can instead design cities and transportation to be like the site I linked above (www.et3.com).
It's their choice though, if they want faster horses instead of cars, so be it.
If they want faster cars instead of et3, so be it.
They prop and fall on their own sword I suppose.