Why it's important that the part of population integrates is because countries extend both rights and expectations to people. Groups of a specific culture that settle in an area and refuse to live under local laws are a problem. Because child/teen marriages are a problem. Because forcing children to beg for the families is a problem. Because living in conditions where large groups rely on begging is a problem. Etc.
How can we say some parents are guilty of child abuse while other parents are just not integrating?