If I was an alien and came to this lovely, green, fertile planet and saw how we treat it and how we would probably shoot first and ask questions later, I would probably jog on to the next planet. 

  Silly observation, we have sent probes out in our lifetime and learnt a lot about this little universe, could aliens have done the same? Will our probes possibly find some form of life in one of the many distant Galaxies? Chariots of the Gods was probably a load of fantasy, but Erich Von Daniken did make you wonder about the possibilities. Some people might say that there is more proof of Alien visits than there is of long bearded deities. 

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