Actually, there's not a single object in this system that we can say beyond a shadow of a doubt is "lifeless". Enceladus and Europa are probably teeming with life, we just can't send a probe capable of drilling through miles of ice that far yet. Mars probably has some subterranean bacteria living off the acidic water that we've spotted leeching out of the ground in places, but again, we've never sent a probe capable of digging down to the groundwater yet. Just because Curiosity or Opportunity haven't taken a selfie with a sample of Martian life doesn't mean it isn't there.
Most people don't realize just how little we actually know about our own little celestial backyard. Take that extrasolar asteroid they were talking about in the news last week. It's estimated that one of those passes by every year or so, and this is the first one we've actually detected.
Then there's all the exoplanet data. We used to think that planets were the exception, now we realize they're the rule when it comes to star system formation. Plus, the closer we look, the more we find planets around the size of Earth, and that's with the equipment we have now, which is nowhere near what we'd actually need to look for life out there. We've already spotted a handful of candidates for life, but we have no way of seeing what's there yet.
Then there's the erroneous notion that you need a planet like Earth to form life. The fact is, life on Earth evolved in this environment, so of course it won't survive on other planets. That doesn't mean that all life in the universe will conform to the template we know. It's likely that life on other planets will have little in common with life here. Therefore limiting our search to Earth-like worlds is somewhat foolish.
Basically, drawing conclusions based on the tiny bit of information we've gleaned from space so far is impossible. We won't really know until we get off our butts and go out there.
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