They have equal rights, as long as they have their citizenship, but the fact is the parents were from another culture, and brought many of their cultural traits with them. These cultures are often very different than the one they find themselves living in. Which creates a feeling in the children that they don't belong anywhere.

There too French for Morocco, but to Moroccon for France. Where do they turn to fit in?
Religion. It welcomes anyone willing to comply to its rules.