Archangel,
Even if people were duped for a long time by a few pieces of fraudulent evidence, such as Piltdown man, and even if some people remain duped by those few pieces of fraudulent evidence, it doesn't in any way detract from the thousands and thousands of pieces of evidence for evolution that come from all kinds of different areas (not only fossils) and stand up to scrutiny.
Do you really think every single person or institution that uncovers some evidence for evolution is part of a worldwide conspiracy? And what would be the purpose of such a conspiracy?