Extraterrestrials will attempt to destroy our civilisation for our planet and its resources

I say this as if there are extra-terrestrials around in our galaxy (I strongly believe there are) the odds are heavily in favour of them being more advanced due to the timescale of our galaxy relative to our civilisation (~13 billion years vs 10,000 years) and the fact that 75% of the stars in or galactic habitable zone are older than our sun.1 A classic example is the Spanish colonization of the Americas. In less than a century, the Spanish colonised large portions of Mexico, North America and the Bahamas. In the process they had decimated local populations with war, slavery and disease. The main motives for this colonisation were the search for additional resources and the spreading of the Catholic faith. I argue that the first of these is a universal factor and that resources will be sought after no matter who or were you are. If we look around on Earth you see life pretty much anywhere that it can exist. Evolution forces all species to propagate and spread as far as possible in a constant battle for survival. If we give some plop some sugar on some bacteria in a petri dish, the bacterial colony grows to take advantage of the resources. So much so that they will rapidly use it up and die when the resources run out. If you look at how human civilisation has progressed then you can see essentially the same pattern. Our current fossil fuel, food and water crisis is testament to that. Technology may help but just like bacteria, if we remain in our closed environment (solar system) we will die. Except we have rocket ships that enable us to leave this world. And in fact we did go ahead and send ships to space and the moon more or less exactly when we were first able to do so. If we extrapolate this to the future, it"s a solid bet that we"ll colonise other planets and star systems as soon as we feasibly can. Since all these points would apply to any species produced by evolution, the long term goal of any species would be to spread throughout the galaxy looking for new planets to inhabit and mine. Needless to say, sharing resources with another race is not efficient. Another cause would be to eliminate any potential threats to your civilisation. If the ultimate goal of your species is to survive and grow then why would you allow another civilisation to survive and grow also? For one, there is a (vast but) limited number of planets in our galaxy so eliminating them would remove any competition as well as ensure that they don"t try to eliminate you in the future. Again you can see this on Earth in abundance. The only logical course would be to remove any and all other civilisations from existence. An interesting point I picked up from the book "Speaker for the dead" (2nd book in Enders Game series) is that making contact and developing a relationship with an alien race may be futile. Any alien civilisation would be just that: Alien in every way. Think of the cultural and behavioural differences that have caused countless wars and conflicts between groups of people in the past. Any cultural exchange between two species from different planets would dwarf this. Could we ever really hope to have a relationship with a species so different from ourselves where one wrong move could potentially lead to a conflict? The only other alternatives are to leave them alone and hope they don"t feel threatened enough to destroy your race or eliminate them and remove the threat altogether. In this case any species with the capability to travel here would have technology so superior that removing us from the planet should be trivial. References [1] C. H. Lineweaver, The Galactic Habitable Zone and the Age distribution of Complex Life in the Milky way, Science, 1 I think I've made enough arguments for now. I look forward to reading your argument.