David Brin agrees with this vision, and thinks that it's better to lie low. Maybe the reason we haven't been hearing radio traffic from aliens is because "they know something we don't know." He also wants a wider discussion of the potential risks and benefits with this new SETI policy.
And no, it is not too late to stay silent: even military radars and television signals appear to dissipate below interstellar noise levels within just a few light years, as proved in a recent scientific paper. They would certainly be far less visible than a directed beam from any of Earth's radio telescopes, and by many orders of magnitude.
Brin agrees that the SETI scientific listening program is important and worthwhile... but transmitting? Do check out the video below!
The 1,000 ft (305 m) Arecibo radio telescope, in Puerto Rico, is the world's largest single-dish radio telescope. It was made famous by Hollywood films like GoldenEye and Contact. Should we really be shouting at the Cosmos with this bad boy?