There's a lot of window dressing around the whole question, but all of the answers boil down to something like -

#1. Everything is far away in distance from everything else

#2. Everything is also far away in time thanks to the first

#3. Far, far more ways to be dead than alive

#4. Far more way to be alive than intelligent

#5. Far more way to be intelligent than human. We may be the only species that thinks flinging itself into the void is a remotely good idea.