Why is light skin seen as beautiful in every culture other than?

European? My little brother is very pale and has black hair and blue eyes, I think he looks beautiful. I'm pretty pale too and I think i'm attractive. Yet lots of white people want to tan, why? Pale skin is beautiful. Also why do dark people in other cultures want to get lighter? I think dark indians are beautiful, so are dark mexican girls. Only race where I think dark skin looks unattractive is on blacks.