In the series Star Trek: Enterprise, they give us hope that we may live on a world free of war... or do they?
The irony of Enterprise is that they are constantly talking of being above war and violence, but they go and get into trouble because of the same mindset that got us into wars. They meet new civilizations; they act as though they are better in some way, forcing their beliefs onto the aliens. They then make enemies with the alien races that they encounter, and by the middle of the series they successfully have three different alien races actively going against them the most recent building a mass weapon to destroy all humanity from the planet. This doesn't seem like they have learned to do things different at all, but maybe, just maybe, that was the intent of the writers.