I sort of agree with Hawkings on this one (usually a safe bet..lol)
But think about it, assuming there are other life forms flying around the galaxy and interacting, any life form that has been around long enough to build the technology to reach us is probably pretty bad ass considering that no other life forms have come along and destroyed them.
Let's use Earth as a mini version of the Galaxy. For the most part, any organism is better off have having no interactions with other life forms as opposed to having many interactions. For example, if I put you in the middle of the African jungle and said I would be back to pick you up in a few days, you would be pretty silly to go out seeking interactions with other creatures. Instead you would be smart to lay low. Yelling and screaming and seeking out interactions would probably lead to you being eaten.
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