Mars is a dangerous place; we knew that when we agreed to make this voyage. A significant number of mankind's efforts to send robotic surveyors have crashed on its surface. What we didn't know until months ago was that something has been collecting the wreckage into a pile.
Our landing site was changed so that Samantha, Luis, Jenny and Ming could investigate the twisted hunks of metal and plastic. They examined it closely, but all they could do was confirm that it was indeed of Earth origin. If Martians have fingerprints, they didn't leave any for us to find on it.
There were no tracks around the site, except those made by Luis' rover. (It's possible that the junk arrived by air.) For those who think it's only purpose is to lure us here, nothing's been disproven.