In dialogue, both sides aim to uncover the truth even if the truth turns out not to be what I wanted or thought. Prioritizing the truth means that I might realise I was wrong and concede the point, even at some material cost. For example, in a property dispute, I might become persuaded of the truth of my opponent’s case and give up my claim. That may be painful, but winning was less important than justice being done. In dialogue, both ‘sides’ are really on the same side because they both ultimately want the same thing.
In war, on the other hand, the goal is to defeat the enemy and it makes no difference whether they are right or wrong – or rather, it is assumed without question that they are wrong. If words are used in war, they are weapons in disguise, not meaningful communications.
This transformation from dialogue to war changes morality itself. You are now judged, not by the sincerity of your pursuit of truth, but by how loyal you are to your tribe. Even to take seriously the opposing position is viewed like reading a propaganda flyer dropped from a Nazi airplane: don’t even read it, it will only twist your mind!
Even seven years ago, fans of Jordan Peterson were fond of the phrase “all I want is to have a reasoned debate.” Regardless of your opinion of Peterson or of whether he exemplified this, those who used this phrase revealed a desire for dialogue rather than war. But today, many of those same followers no longer say that. Now they say, “the left is out to get us and must be stopped” and their counterparts say, “the right is out to get us and must be stopped.” Reasoned debate is seen as no longer effective in light of the vile underhanded tactics of the other side (but not, of course, of my side).