Not the person you replied to, but vilifying the other side is just adding fuel to the fire. Let's say your country and my country are at war. What has a better chance of achieving peace, 1) me saying that you're an evil dictator who does evil things because you're evil and probably insane, or 2) me saying that even though I disagree with you, things are not black and white and my side did some bad things to you too and looking for some reasonable compromise.

To me 1) only makes sense if I think I can defeat you militarily, which doesn't seem probable here. I guess 1) also makes sense if I don't want peace at all and don't care about how many people die, but I'm sure that's not the case.