Islam is a lot of things but "smart" isn't necessarily one of them.
It's a pretty basic primitive mob which controls its subjugates through coercion and implied threats, and often times, makes good on those threats through acts of indiscriminate violence. Atleast that's what it accounts to under the context of Western nations, little more than the Sicilian Mafia, in effect.
In the Middle East, Islam has more "meaning" and philosophy and guidance to offer to its advocates. But in the West, Muslims mostly take control of the lowest elements of the society, the prisons, the drug trade, the most poverty-stricken corners of the cities, and escalate from there to establish their own law and order, after having wrestled the monopoly of violence away from the local government. Because without a monopoly on violence, Islam cannot operate, as it's almost purely a fear and terror-based construct, not truly competitive as far as matching morals or philosophy or factual evidence in favour of its case, against competing ideologies.
The fear of real-world retribution and punishment is what keeps the subjugated (and most especially the non-Muslims) in line, more so than any philosophy of karmic or divine retribution. Terror attacks, honor killings, street beatdowns on unfortunate non-Muslims who stumble into Muslim-controlled areas, all serve to establish Islam's reputation as a group that is not to be "fucked with", and even the most modest Muslims understand their primitive function, even if they may find such things uncomfortable to live with.
Muslims are quite easy to understand, and to keep "in check", unless there is an intentional ("multi-cultural") attempt to enhance their efforts to establish a parallel society of their own. Which there is.
If the US had operated on a similar mind-set as the European states do nowadays, they'd still have the Italian Mafia and Irish Mob in charge of local and even state-level affairs.