I believe also that there are other nonviolent effective ways to fight an aggressor. Many of the pacifists see it as an immoral act. When oppositions to push violence to its bounds is based on the consideration that such would be morally wrong due to the nature of war. Many of us might opposed to war especially when it is not justified, but if we see it from a pacifist point of view a war even though it is just it is morally wrong because it destroy many individuals lives and might affect the planet as well.
An example of a Just war it would be world war two, which had many of the criteria to be a just war. The world war two was fought by Germany and allies which all of these were legal authorities, this war had good intentions which were to stop Hitler and his Nazi army from invading countries and harming people, it was a war that was fought for the freedom of the oppressed people. This are some of the reason of why I think world war two was a just war, if this war didn’t had been fought, we would all be living under fear for not fitting in a certain stereotype, and many more people could have had been