I'm all for such programs, but I am very wary of their success. There are other issues at play in peaceful group interaction.
For years various ethnic groups lived side by side in hotspot countries. The strong govt changes and the groups revert to their old viscious violence, such as in former Yugoslavia and Iraq.
I know of increased prejudice and trouble when previously separate youth ethnic groups get mixed together, sadly to say.
The theory "if we only got to know each other we'd get along" is by no means the saviour. In WW II Americans the Soviet soldiers got along great to win the war but hostilities arose immediately afterwards, thanks to Stalin.