People simply dislike anything different. Look at Yugoslavia and compare its disintegration to Checkeslovakia (sp?). Even if you're in the same group, if you show characteristics outside that group, you'll be spurned, reviled etc. But should a threat to both groups appear, then the groups will gel together (qv WW2) temporarily.

The Jews maintained themselves as seperate, therefore they were subject to this effect. It's not their fault and it's not the oppressors' faults; it's simply human nature. This does not excuse the behaviour, though. Now we've recognised it, we can act on it, BUT it requires effort and consideration on BOTH sides. If you're a Jew and join a Christian organisation you need to accept that sometimes you may be asked to work on a Saturday but will have Sunday off; equally, if you're a Christian and join a Jewish organisation, you need to accept that sometimes you may be asked to work on a Sunday but will have Saturday off. If you as a Moslem manager recruit a Christian you need to explain to them beforehand that Friday is the main day off, not Sunday, AND they need to check this with you too. And vice versa.

Conversely, if you find yourself in a particular situation by necessity, don't bleat but try and work your way around it and if that's not possible, then remind yourself that it was your decision in the first place and bear responsibility for that decision.