Humanity may be alone in the Universe
Ethan Siegel

That all these odds were overcome and intelligent space faring life exists on earth is itself a clear evidence that our arguments and conjectures are invalid. All your arguments if applied to a young solar system would have ruled out life ever appearing on earth. But it did. We are here. Only we refuse to accept that our intelligence is yet insufficient to grasp what life is and where to precisely look for it.