"It's important to recognise that immigrants are not a monolithic group and many have already been exposed to values and social dynamics similar to those in Western societies. Rather than using fear based rhetoric, we should focus on effective policies to protect all citizens regardless of origin.
I think most of us know that the men who seek asylum in western countries are not a homogeneous mass, they emanate from countries across north Africa, sub Saharan Africa and the Middle East with their own distinct cultures, customs and standards.
However, you refer to effective policies to protect "all citizens regardless of origin" I'm not sure that's always worked both ways. The unprecedented mass sexual assaults of over 1,000 women in Cologne by men of North African origin, originally covered up by an embarrassed government who just wanted the problem to never have existed and go away doesn't therefore at times extend to the indigenous populations. There are cultural differences that "some" of those that emanate from north African countries for example can be reflected in behaviour patterns that aren't effectively dealt with by their governments. For example, Tahir Square in Egypt has been known for its mass sexual assaults of women, commonplace during festivals and political protests. The modus operandi is for a smaller group of men to encircle a woman, where an outer circle physically deter anyone from trying to intervene, the woman would then be stripped of her clothes and be assaulted both vaginally and anally. These incidents have been documented by Egyptian Women's Rights Organisations and the United Nations. Such an assault happened to CBS Reporter Lara Logan, who stated in the aftermath she was lucky to escape with her life. The onus of whatever a woman might suffer in such a scenario is often placed right back at her, as a woman she should not be out in the cut and thrust, but indoors.