Questioner, you are off in the weeds with your thinking about human nature. Calling it "collective narcissism" is basically circular logic that doesn't produce any real understanding.
First, look at the definition of narcissism at
https://www.mayoclinic.org/diseases...onality-disorder/symptoms-causes/syc-20366662 , which says:
"Narcissistic personality disorder is a mental health condition in which people have an unreasonably high sense of their own importance. They need and seek too much attention and want people to admire them. People with this disorder may lack the ability to understand or care about the feelings of others. But behind this mask of extreme confidence, they are not sure of their self-worth and are easily upset by the slightest criticism."
Saying that the whole human species has that "disorder" makes it normal, not a disorder. Hence, you are in a closed-loop claiming that everybody is wrong, except perhaps yourself for recognizing that everybody else is wrong. Not realistic, and not logically useful to understanding.
You mentioned
"We are God's chosen people and God granted us this real estate!"
which I assume is making reference to the current war in Israel/Palestine. Please note that land was originally occupied by Neanderthals, and was
taken from them by my ancestors
and yours. Once history became recorded in a manner we can review today, we see that our collective cousins-many-times-removed have been fighting over that land almost continuously, even before the the current combatants were there, and well before either of the currently conflicting religions was established.
So, it seems more productive to me to understand that the fight is over resources, particularly the land area, in that case. It isn't that people are being "narcissistic" about it. It is natural for humans to value themselves and their immediate family and their closest relatives and their more similar neighbors survival more highly than they value the survival of more dissimilar and usually historically hostile "others".
That isn't "narcissism". It is the predictable effect of over populating a region so that there is competition for the resources needed for survival. We see the same effect in other social species - in particular, in wolves and chimps.
The excuses that societies create for collective assembly and combat do get influenced by narcissistic "leaders" who may use "religion", "ethnic purity" or "populism" arguments to galvanize their "supporters" into collective warfare actions. But, that doesn't make their followers "narcissistic". The followers are basically just short circuiting a very complex decision process for themselves by accepting a prefabricated story that seems to justify them taking action to achieve what they think they need for their own well being. That need most often is food or safety from perceived threats. We are seeing tens of millions of people immigrating into the U.S., Canada, and western Europe from places in Africa, South America, China, etc, because they feel either unsafe where they are coming from or they do not see any way to support themselves in the regions they are leaving. Are you calling them "narcissists" too?
Trying to pull this conversation back to the topic of the benefits of humans "entering space", I am hoping that the overviews and detailed data we get from space help us better understand the limits of our biosphere and how drastically we are changing it by our activities to "adapt" it to human benefit at the expense of other species with which we share it, as well as to ourselves. It is easier to change a person's mind by showing them something than by only telling them about it. As the saying goes, "seeing is believing". So, I am hoping that people seeing the deforestation, desertification, flooding, etc. on a global scale makes the proper impression. And, I am hoping that the enhanced communication capabilities for on-the-ground reporting help people understand the harsh realities that much of humanity faces every day - even where there are no active wars occurring.