Theres a difference between intelligent life and non.
And the more intelligent we become, the further humans, as opposed to governments, are moving away from violence. Thats a fact.
And the days of empires conquering empires as a matter of outspoken goal are over. They may be doing it on the sly, but they cant in an outspoken way because humans dont support it any longer. Thats not even debatable.
In the 21st century, there is no evidence at all that that is true. With 30,000 gun deaths each year in the U.S. alone, how do you suppose that we, for instance, are becoming LESS violent?
The fact is that life on Earth, all life, is very violent by nature. It's a dog eat dog world out there, and there is no reason to suppose that that isn't the case everywhere in the universe.