They come here for the supposed economic and personal freedoms we claim to offer immigrants (lawful ones). However, coming from a society in which women are supposed to keep themselves according to the extremely conservative religious and cultural rules, the men are dismayed when their daughters and wives start accepting our loose morals and standards.
This is commonly called "culture clash" and has been going on for as long as there have been separate societies. I don't agree with the course he took, but I can understand his anguish.