Beings from outer space

If there are really Beings from outer space, I don't think they will need anyone's approval to appear in front of the public, unless they are living in a vibration that cannot be seen by the naked human eye. 

If  these Beings from outer space have technologies that are far superior than ours on earth, and if they can use ESP or telepathy, then they can unload all these information to all of mankind, why would they only reveal it to a few people who will not even share this information worldwide?