In light of this, contact with an alien intelligence may be even more dangerous than we think. Biological aliens might well be hostile, but an extraterrestrial AI could pose an even greater risk. It may have goals that conflict with those of biological life, have at its disposal vastly superior intellectual abilities, and be far more durable than biological life.
That argues for caution with so-called Active SETI, in which we do not just passively listen for signals from other civilizations, but deliberately advertise our presence. In the most famous example, in 1974 Frank Drake and Carl Sagan used the giant dish-telescope in Arecibo, Puerto Rico, to send a message to a star cluster. Advocates of Active SETI hold that, instead of just passively listening for signs of extraterrestrial intelligence, we should be using our most powerful radio transmitters, such as Arecibo, to send messages in the direction of the stars that are nearest to Earth.
Such a program strikes me as reckless when one considers the control problem. Although a truly advanced civilization would likely have no interest in us, even one hostile civilization among millions could be catastrophic. Until we have reached the point at which we can be confident that superintelligent AI does not pose a threat to us, we should not call attention to ourselves. Advocates of Active SETI point out that our radar and radio signals are already detectable, but these signals are fairly weak and quickly blend with natural galactic noise. We would be playing with fire if we transmitted stronger signals that were intended to be heard.
The safest mindset is intellectual humility. Indeed, barring blaringly obvious scenarios in which alien ships hover over Earth, as in the recent film Arrival, I wonder if we could even recognize the technological markers of a truly advanced superintelligence.
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