I am more of a listener than a talker, so pardon my soliloquy.
Human beings evolved from animals, in fact we are animals. Therefore, we still have their traits. We are territorial and we protect our own. This could be proven time and time again, by the wars that have been fought.
Over the centuries, through enlightenment, our lives have become easier. We stopped living hand to mouth and started to settle down, our technology evolved, we created the concept, division of work. This allowed us to think conceptually about life.
Initially, for centuries we had a feudal system. One dictator that controlled and owned everything. The major flaw is the contentment of the society is based on the mental stability of the leader. If the person was benevolent, the society would be utopian. If the person was malevolent, the society would be Dante-like. People started to think, there must be a better way.
Government started to evolve, from Dictatorship, to Democracies, to Socialism and to Communism. What parallels this evolution is using land as a point of reference to idealism as the point of reference. The problem with this is idealism is conceptual not tangible, there are no borders, there are no fronts.
People are still animals. They are greedy and competitive. They always want to be the best winners. They want the biggest group. Some will use any tool to get it. This is why war is so gruesome.
In this time and age, war is different. We now fight war with the most destructive weapons about intangible ideas because we are still very animalistic.
War is not good vs. evil. War is guilty vs. innocent. War is to protect the innocent. They are the real casualties. The innocent are entities that are there by timing or accident, the humans, the other animals and the plant life. Remember without plants and animals we cannot survive. Millions of innocents get killed in wars.
The difference between good and evil is a point of view. The other group is the evil ones. Therefore, in the world there is only good. There are different religions and different types of governments. Even under the same groups there are different sects with different points of views. The best advise I know is not to hate them but try to respect their point of view.
Now all these sentences make me sound antiwar. I am and I am not against war. No war is a just war. When people get killed, they are dead. You just do not only affect the dead person, but also his/her family and friends. There is a ripple effect. Now if bystanders get killed then I say go to war. If they invade go to war. Protect the innocent.
Well thank you for reading my opinion.

P.S.
To defend my friend, what is wrong with being a janitor? Do not forget that Albert Einstein was a patent clerk in Switzerland, when he thought up his theories.