Thats "nice" and all, except this is not the String Cheese Incident forum, but The Philosopher. You'll find very strong rebuttals of most things "pan" lol, especially some notion of "pan-humanism".
The view of humanity as "one", that, above all difference, shares some common ground that is foundational enough to overcome differences in geography, ethnicity, culture, and history is an ideology and a very tempting one. It is also very dangerous and presumptive.
Why is it dangerous and presumptive?
All (fully functional) humans function on similar instinctual foundations. All are capable of using their brain to take a more long term view than 'the present moment'. The benefits of peace and understanding amongst humans are the same no matter where you come from. All that stands in the way is wrong, thus both personally and globally, damaging beliefs. Conquering that would clearly be no mean feat, but what are the alternatives? Immigration would seem a driving factor for understanding, and the tearing down of false belief, to me. Short term turmoil would seem moderately inevitable, I see no reason for anyone to assume it would continue down that path though.