I've had an idea for awhile based on anecdotal evidence from UFOs and reported abductions which I'd like to present here. Essentially it proposes the concept that only a species which is telepathic could possibly develop the economics, technologcial and other resources to achieve star travel to another planet with life. Otherwise that species is likely to destroy itself or lack the needed infrastructures to do it. That's based on a few things 1. People report aliens are telepathic and communicate using thought 2. UFOs are suggested by their lack of noise to be 100% efficient in energy use 3. We see a hierarchy in place due to their telepathic society 4. No other contacts have been made besides with telepathic beings I personally believe telepathy is organic in nature and we simply lack this ability outright.