Lyric discussion by Durang0 

Cover art for Como Estais Amigos lyrics by Iron Maiden

I like to think it more generally.. that the song is about the violence and injustice of our history. And if we fail to learn from it then "the wickedness and sadness" will come to us again. And also that mourning for the past doesn't make the world a better place, remembering what's wrong and right does.