I don't think our leaders/governments have learned a thing but I also don't believe our young people would jump to join the armed forces as they did in 1914. Or am I naive to think they are more savvy about the implications of war in this day and age of technology.
There's no British Empire anymore, so that ought to make a difference, except British Prime Ministers and Foreign Ministers don't seem to have realised that yet.
Think back to the first Gulf War - George Bush's (senior) coalition of the willing. People, including young people, avidly watched the television footage which was presented as if the war was a video game.Naive in the extreme, I think. Of course, video games have become more sophisticated since then, so the embeds would have to up their game too.
Humanity may have learned something since 1918 but it's clearly not enough.