The Planetarium Hypothesis, is a possible reason why we have not had wide scale Meetings Directly With Aliens. The Planetarium Hypothesis supposes that alien life have created an experiment in which we are artificial intelligence existing in it and carrying out the experiment to see how it will go. It is sort of like living in the Matrix (The same as the movie).
This belief is more common than many might think. I have met many very intelligent persons that believe this is exactly what is happening to us here and now. Anything out of the norm is actually parts of the 'experiment' that we are seeing.