Why there is not a life on Mars?
Because on Earth still do not reign peace but wars.
I am more than certain for the same reason,
the lives from other stars systems
which resemble to us, not so and quite a different
not visited to us and hided themselves,
because they are all in state of shock and intimidation
by our bad manners and behaviors.
No one want deal with such bad company
and with so spoiling neighborhood and relationship.