Darwin, in his "origin of the species", stated his theory of evolution. As for macro-evolution, he pretty much disproved it in his book. His reasoning is that if species evolved from other species by a series of mutations, there should be species halfway between other species everywhere. They should exist in the world today, but even if not, the fossil record should be FULL of these "transitional species."
In truth, there isn't a single one, anywhere in existence or in the fossil record. The closest they got was a half dinosaur/half bird that turned out to be the product of two skeletons and some glue. Now Time is justifying it by saying that dinosaurs had feathers and slept in the same position as birds, which is terribly interesting but doesn't solve the problem of transitional species. Time states it as fact.
So, the conspiracy, or lie, is that not only does scientific evidence not support evolution, it actually points toward disproving the theory. Meanwhile it is being taught as a law around the world.
I think the motivation is that it gives a scientific basis for discrediting creationism.