The Question No One is Asking about Keystone XL

Right now in Texas, a foreign corporation, TransCanada, is using our government's 5th Amendment right of eminent domain to confiscate private land belonging to Americans, to build a massive oil pipeline so TransCanada can ship oil from the Gulf of Mexico to non-Americans around the world. Oil, by the way, that will accelerate our planet's plunge into global warming-induced catastrophe. So the question is, "Why?"