So what? There should be some rational basis for the exclusion. Advocacy of violence against groups or membership in groups who so advocate violence is narrowly tailored. To say that objection to homosexual activity as immoral should bar one is giving legitimacy is providing support to the left-wing thought control police who want to criminalize selective "hate speech" as they have done in Europe and Canada and have created a right not to be offended. Yes, of course immigrating is a privilege, but enacting this left-wing thought control nonsense in this context is of a peace with criminalization domestically and is not narrowly tailored to fit the precise objection to potentially violence-minded Muslim immigrants.
If you don't want to live with Dutch culture, don't move to Holland. I can't think of anything more "rational" than that.
Advocacy of violence against groups or membership in groups who so advocate violence is narrowly tailored.
Anybody can say they are nonviolent. Yasser Arafat did it all the time (when speaking in English for Western audiences).
Pretending to be civilized when confronted with an image that hammers on one of the barbarians' hot buttons is more difficult.