Actually, the aliens have been around for a long time, but they are dimensional, at least in the way that they contact us. They are called devils and demons, even openly.

One of the problems with drugs, both the legal and the illegal ones, is that they often twist the mind into hearing and seeing the devil aliens. Then we go out and act stupidly, or commit crimes and mass murders, all because we are influenced by the aliens.

People need to wake up and see that the aliens ARE hostile, and that they are all around us, often being prescribed by our doctors and medical community, even though the medical mostly doesn't know what it is doing.