Or one Muslim on board and it’s doomed...
I am a SF fan as well is a few of my friends. It has been a while since we popped open a Glenfiddich and then spent time discussing space travel in generational ships. One thing that was always agreed upon was that the travelers should probably racially pure, maybe even politically pure or at least similarly inclined. The reason always boiled down to this: the journey will be tough enough without having to contend with the extra issues that a ‘racial rainbow’ ( I don’t mean ‘gay’ in any fashion) or political extremism would eventually bring about. There is plenty of diversity within each major category of race to avoid the boredom argument. No need to blend on a single spaceship.
... just my $0.02 USD