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Could be both...
Read a story once, about aliens visiting earth to lament the state of warfare over the centuries. They said they'd be back to check our amended habits in a year.
A year later they returned to find that sustained world peace and harmony had broken out.
They were very upset because we had been 'bred' by them to be hostile little warmongers.....
Every major war has led to major technological improvements, arguably fuelled by huge steps in intellectual evolution.
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