There is no greater source of strength in the world than unity, and no greater source of weakness than disunity. That is why Islam teaches one to maintain unity at all costs, no matter how much one has to sacrifice in the process.
When Moses was rescued from the Pharaoh he visited Mount Sinai for 40 days. While he was away, Samiri lured the Israelites into worshipping a golden calf. Moses’ brother Aaron had been left in charge of the people during Moses’ absence. He did his best to discourage them from worshipping the calf, but with no success. When Moses returned to see his people worshipping an idol he took his brother Aaron severely to task. “What stopped you”, he asked his brother, “from putting the people right when you saw that they had gone astray. Why did you disobey me?” This is how Aaron excused himself, “Son of my mother. Do not seize my beard or the hair of my head. I was afraid that you might say: ‘You have sown discord among the Children of Israel and did not wait for my orders.'” (Quran 20:92-93)
Solidarity in a community is so important that the greatest prices can be paid in order to maintain it. In the life of a community, everything else comes after solidarity.