So, since it is impossible to know what is in someone's mind and magically discern when a "good" muslim is about to go bad, the only logical solution is to deport any who are not already citizens, and mercilessly surveil the rest. Then, any remaining muslim who shows so much as a hint of "radicalization" (really just a euphemism for "observant muslim") should have their citizenship revoked and be imprisoned, to be followed by finding them a "more suitable home."
Anyone with half a brain knows that no nation can continue to import these people without dire consequences. It's like filling your home with Bengal tigers and pretending they are actually cute little kittens. Eventually, you are going to be mauled to death, no matter how "tolerant" and "loving" your mindset.
Reality has that effect. Deny it at your own risk but no Gv’t has the right to deny it when their citizens are in line for the consequences.
I think they can control this, they’ve lost their will. Take the US, the FBI has been restricted in how they can investigate somebody because of the muslin brotherhood infiltration under osama. They can start sending people into the mosques, closing the radical ones, interning muslin males of military age, deporting the migrants.