There is a simple reason which explains what you perceive as a paradox. The past leaves clues which can be examined. So far, we've received no information from the future.
Since when is science infallible...LOL (i.e Hiezenburg principle)
The point of science is indeed to predict what will happen under a certain set of circumstances. If evolution were a science it would be able to predict how species would develop, but of course it cannot do that because it is not science, it is bull duty.