War has persisted throughout history ever since the dawn of mankind. That’s probably the best indicator that it will persist for all eternity.
Think about it. All literary and religious stuff is about conflict, serious and bitter conflict. Our play and entertainment are all about conflict. Look at the popularity of computer war games, at the popularity of sports which are but epitomes of battles and rivalries; look at the popularity of crime stories, at the popularity of – mind you – Star Wars movie series, as if world wars did not fully satisfy our militant fantasizing! We are hardwired for experiencing conflict in one way or another, much though nowadays we are trying to convince ourselves that the opposite is true. Medieval Christian chroniclers, who most often were Christian priests, i.e. preachers of love and charity, rebuked princes for idly staying at home rather than leading their warriors and knights on conquests. Islam was no better in this respect. The first two or so centuries from its inception were characterized by militant conquests: there were no apostles of Good News but rather mounted warriors wielding curved swords. It is only now that we are squeamish about armed conflicts and frown upon crusades or the conquest of the Americas. And yet we do it in a hypocritical way: we have removed words like war, military campaign or intervention from our polite vocabulary and we call these phenomena spreading or saving democracy, preventing humanitarian disasters, defending prosecuted minorities and what not. Nonetheless, by whatever name a rose is known, it is still a rose.
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The men who shook hands in this true story on the battlefield in 1914, were court marshaled.