I'm not sure where you're going with this one. Confronted with the fossil evidence, what does ID say? This is where the Incompetent Designer jokes come from. Why would a designer create most species to be extinct?
Are the fossils not real? (Radioactive dating is fake!) Are they the work of Satan? (A kind of anti-designer maybe.) If form and structure don't mean anything, what's the point of worrying about other life on the planet? Fire up the barbie and let's see how they taste.
They are fossils.