Alien Invasion: Could it / Would it Really Happen?
The first thing to consider is why aliens would even want to attack or invade us in the first place, and this can be a bit tricky, with numerous theories on why they would even bother, and different possible outcomes to an invasion based on what they are after.
One idea that has been thrown around is that they would be after our water or other resources, and that seems to make sense on the surface, but looking into this possibility more deeply brings about some problems. First of all is that it is believed that there are vast amounts of water frozen and locked away within asteroids, comets, and uninhabited planets, moons, and planetoids, so it seems a bit odd that they would want to use so many resources to travel all of that way just to pry the water from our cold, dead hands. Wouldn’t it make more sense for them to just mine nearby systems for all of that unused water floating about in space without any objection? And say they really do need us for our water, even if they did, there are numerous logistical problems involved with stealing it from us, and the same can be said of other resources as well.
Another idea is that they might want to use us as a food source or as slaves, which also doesn’t make sense considering that even evolving on the same planet we are actually pretty limited with what is edible for us or available for us to eat. With aliens with totally different evolutionary histories and physiologies it seems highly unlikely that they would find us edible are all that good-tasting, especially not enough to come all of that way, and we could actually even be poisonous for them. There is also the same problem with water and other resources.
More than half of American adults and more than seventy-five percent of young Americans believe in intelligent extraterrestrial life. This level of belief rivals that of belief in God. American Cosmic examines the mechanisms at work behind the thriving belief system in extraterrestrial life, a system that is changing and even supplanting traditional religions.
Author; D.W. Pasulka - Available here: https://amzn.to/2ZLxK7k
By Bret Swancer, MYSTERIOUS UNIVERSE