What people individually think has little to do with who is considered an ally and who is considered an enemy. These are decisions made by our "representative" governments which ultimately shapes society. In a democracy your voice is defined by what you vote for. As people keep voting for people that are more than happy to buddy buddy with anybody, regardless of how awful, so long as they are geopolitically obsequious, then that is the status quo of "society."

And there will always be war for the same reason there will always be murder. I would argue that rather than trying to frame a society around the concept of preventing war, it may be more pragmatic to try to minimize the impact of war such that otherwise minor conflicts between two nations don't end up dragging the entire world to war, for what is always framed as some greater good, but invariably just results in exponentially more death and destruction with far less than nothing to show for it.