We will never until we go there or we can take something back to earth to make direct mesure on it.
Anyway why think Mars could not have hosted life ? Its' like a desert planet, it's maybe naive, but if we go on an nuclear war, our planet will look like Mars in 1 billion years. Do not forget that dinosaurs get exterminated by something, if that was a meteorite why not imagine it could have hit Mars too, even really bad to the point the planet lost his atmosphere and maybe was broke apart, would also explain the Asteroid belt. Then a piece of it, or a piece of Mars could have hit earth and have consequences we know.
Maybe all of it happened hundred of thousands years before that, the original Mars was hit, destroyed, and then became what we know. Maybe life came to earth from Mars. Or maybe there was a huuuge planet that got destroyed and became all planets that are into the asteroid belt.
When we do not know, all theories are to be explored, not saying we got to put thousands of scientists and millions of $ on it, but at least keep it as a possible thing. That is just common sense to me, I have no beliefs on it, just really diverse hypothesis, that is how science go on, by dreaming and cutting down possibilities by mesuring things.
Really interesting post anyway :-)
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