A nation that might fit this description may have had their populace indoctrinated (through a widespread political campaign) to believe that the majority of the world throughout history seeks for their destruction. That's a reason for why they think that way, but not because they woke up one day and decided to choose violence.

However not a justification, since I believe that what is happening today is truly evil. Same with another nation who entered a war knowing they'd be crushed, which is suicide; whether that nation is in the right is of little effect if most of their next generation has died.