Non-stop human crimes on the planet Earth could be the reason why other beings from space are reluctant to expose themselves.
Dr. Gordon Gallup, a biopsychologist at the University of Albany, claimed humans are continually involved in battles, which may have caused life in space too "scared" to be detected. Humans are 'aggressive' and 'dangerous,' he continued.
Gallup made his case in an open-access publication published in the Journal of Astrobiology this month titled "Extraterrestrial Intelligence: A Cognitive Evolutionary Perspective."
Other Beings Refuse To Reveal Themselves To Dangerous, Aggressive Humans
Other beings refuse to reveal themselves as humans are "dangerous" and "aggressive," Gallup claimed.
"If there is intelligent life elsewhere, they may view humans as extremely dangerous. Maybe this is why there is no proof or compelling evidence of extraterrestrial intelligence," the scientist wrote in his paper, Daily Mail reported.
"We pose too great a risk, and they do not want to be discovered," he added.
Gallup blames humanity for the planet's current situation and modern civilization, which has a history of genocides and destruction.
He also speculated that aliens are likely to be technologically advanced and have already discovered mankind.
However, "increasing pollution, habitat devastation, constant wars, plunder, murder, destruction, and the drive for conquest" kept intelligent life away from Earth.
Stephen Hawkings Might Be Right About Alleged Beings
Gallup's image may not be wholly false. Late astronomer Stephen Hawking, supported the intelligent-life idea.
"The idea that we are alone in the universe seems to me completely implausible and arrogant," Dawkins said per NBC News.
Given the number of planets and stars known to exist, Dawkins contends that humans are highly improbable to be the sole form of developed life.
Hawking has even warned of invasions, comparing them to Christopher Columbus' first voyage to America, which was terrible for the indigenous peoples.
Other Life Forms in Outer Space
The University of British Columbia researchers said in another Daily Mail report that there might be as many as six billion Earth-like planets in the Milky Way galaxy alone.
According to NASA, 4.933 exoplanets (planets beyond our solar system) have been confirmed in 3,704 systems. NASA's online database revealed that the bulk of these exoplanets is gaseous, like Jupiter or Neptune, rather than terrestrial.
Gallup said of intelligent life found elsewhere that the history of biology on Earth makes it evident that intelligent, technologically complex life is the exception rather than the rule.
Although there are billions of different lifeforms, Gallup added that intelligent life with complex tool-making capabilities and the cognitive ability to achieve self-consciousness has only appeared once.
That makes the prospect of finding technologically sophisticated intelligent life elsewhere exponentially remote.
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