We were talking about immigrants. But the UNHCR does not 'screen' anyone. How do you imagine they would do that? They interview them, but mostly asking for their names, where they came from, and other details. The UNHCR is not equipped or trained to find out what the general cultural values are of the people they feed. Why would they even care?
Concerning refugees, you should
check this out.
Certainly not perfect, but I would like to know what more is reasonable to expect.