Yeah, they should expell them , but how?
They were born there. Their own laws would mean any move in this direction means they are systematically picking on a citizen with a certain religion or political affiliate and stripping their citizenship, seizing their property and deporting them.
How then could they not do it to anyone the ruling party doesn’t like? Christians, Conservatives? Do you pass a law proclaiming islam as not a religion worth of protection of religious freedom, classifying it as a cult. Do you state any and all followers of said cult are enemies of the state? What of Sharia, do you proclaim Sharia as a political ideology not worthy of freedom of association and democracy? Again, if so, how do you keep consistent with not having some liberals do that to conservatives should they feel the need?
See how the society has already totally fallen. The problem I point out is the proof that the society as is such already does not work and is illegitimate and dysfunctional due to its failure to handle this conundrum
They will have to abandon all tenets of liberty first including disbanding their own government structure and constitution equivalent documents, then fight, then remove, then re-establish liberty much later.
The same will happen here if we let any more in. Right now we have the chance to deport all recent muslim immigrants, as the natural born ones are still very few part of the population and won’t have power.
You draw the line at insurrection. If a particular group of people want to impose their will upon you, in violation of a nation’s laws, then that nation has a right to mitigate that group. With your logic, the bolsheviks were justified in killing the Tsar, the German socialists were well their rights within putting Hitler into power, and basically anyone who can pull off a coup or power grab, can, and be justified in their actions.
One law you overlooked is the law of self-preservation.