If everyone had everything they ever wanted then we probably would not even have invented a word for war let alone know what it actually was.
Humanity has limited needs, and infinite wants.
I have long believed that humanity will never be united until an outside force (be it some kind of deity or an alien invasion) prompts it.
Maybe I'm just a pessimist

Or maybe I'm a realist?
Only time will tell. Which exists by the way, just because we measure it doesn't mean it was created by us. Thats like saying humans invented water because we measure it in liters

I say that some kind of god exists (for the sake of argument, not necessarily the one I believe in) because there is atleast a handfull of values that permeate throughout all of human society. Such as that murder, theft, and infidelity are bad, and that anonymous charity and self-sacrifice are good.
Despite some branches of our species being seperated for over 10,000 years these moral values are a near constant. This alone means nothing, such an occurence can be attributed to evolution. Except that all of these values contradict natural selection.
If you kill another man there is now more for you and your offspring. The murdered obviuosly proved the inferior, thus the idea that murder is good
should be in our society. But its not.
If you steal from another, they are made weaker, and you stronger. Those who steal would have a greater chance to prevail and a greater chance to breed. Stealing
should be considered good in our society, by the laws of natural selection. But its not.
Infidelity (or multiple partners) allows the more desirable to sire more children and spread their superior genes. Humans (more often than not) mate for life. Infidelity/Multiple Partners
should be considered good, but its not.
Anonymous charity drains the substance of the giver, with no benefit, and increases the substance of the reciever. Greater chance to breed, blah, blah, blah, you know the bit. Should be considered bad, but its not.
Even more so with self-sacrifice. The man/women who pushes a child away from a moving bus (or stampeding buffalo) can no longer spread those good person genes. I think you get it by now.
The only logical conclusion is that humanity has been instilled with a moral code by a higher power. I also say that its only humanity. My dog steals licorice right out of my hand all the time.