I agree that remembering people who have died in conflict is important. (Not just the death of combatants, but civilians too.) But I personally prefer not to do so by wearing a poppy or taking part in Remembrance day events. I can do so in my own way, and don't feel any need to be performative and tell the whole world about it.
I'm sure many people take part genuinely and in good faith, but it's a bit naive to assume that everybody does. Beneath the surface some of it seems very insincere and even hypocritical to me. The political elites and ruling classes typically use military power to further their own selfish agendas, and send expendable pawns to risk their lives and kill their fellow man for those causes. In order to win their blind loyalty to King and Country, they use propaganda to spin the narrative that it's the heroic forces of good versus the villainous forces of evil (though conflict is never as black and white as that). And instead of actually caring about their soldiers as human beings, looking after them in tangible ways or dare I say joining them to fight on the battlefield themselves, they repay their loyalty mostly with lip service and empty gestures. And then they encourage everyone else to virtue-signal and do the same. I don't agree with this and I don't think people should be fooled by it.
I believe that remembering war casualties is important, because it is a reminder to ourselves of how tragic war is. It results in absolutely needless loss of life, mostly of innocent people who just want to live peacefully, mind their own business, and probably don’t even care about the issue being fought over. Over a million people were killed in Britain’s war with Iraq, whose crime was merely to exist in the wrong place at the wrong time. People’s children, parents, spouses and siblings are taken from them and their lives are ripped apart, all for the sake of one government’s beef with another.
I'm reminded of Blaise Pascal's quote here: "Can anything be stupider than that a man has the right to kill me because he lives on the other side of a river and his ruler has a quarrel with mine, though I have not quarrelled with him?"
Unfortunately I don’t think Remembrance events embody any of this. They come across more as a “thank you” (of debatable sincerity) to those who join the armed forces and take part in war, instead of urging them not to go near it and not to have anything to do with it.