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Well, but researchers are supposed to be looking at the data and questioning everything in search of the scientific truth. They still do have water in the polar ice caps, and there's certainly water elsewhere in the solar system like on that moon of Saturn.
It's just a case where, if people *want* to see something (like water) they will see it and look for all possible ways to make it be what they want it to be and not necessarily what the data always indicates. And the atmospheric conditions on mars are such that those gullies being formed by "liquid water" are questionable.