Balance is the key to everything.
People who shut their mind to the potential of aliens, underestimate the size and scope of the universe and overestimate our current knowledge.
People who indulge in unfounded alien theories,
underestimate our fundamental understanding of life and overestimate faster
than light travel.
Does life exist on other planets?
Most likely yes. We simply haven't discovered it. In fact
even life on earth could have originated in Mars.
Does intelligent life exist on other planets?
Likely, but slightly. Evolution is a long and tedious
process.
Has intelligent life discovered Earth?
Improbable, but possible. Faster than light travel is
theoretically possible, but the probability of an alien species capable of
doing so is very miniscule.