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They want to goto Gale Crater because it was most likely the bottom of a large lake. It's a good place to start when looking for the presence, past or present, of life. But that doesn't mean it's going to be found there. Nor does it mean that not finding it there that Mars never had life. As I said previously, the only surefire way they'll know if there was life there or not, is to go there and do the exploring ourselves. We're far better at finding fossils and/or living organisms than computers and machinery/detectors are, and if we get fooled sometimes with what we find, imagine how much more difficult it is for a probe. It can't think, nor extrapolate the possibilities....we can.
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