Inclusive liberal democratic societies face a challenge: What happens if the people we allow to participate don't want to be free? Do loose immigration policies and multiculturalism endanger freedom?
The concern of the day (though historically I doubt it's exceptional) is about Muslims. The argument goes like this: "Muslims have a higher birth rate than other groups in Western countries, and many of them want something like Sharia law and an Islamic state. Islam lacks an appreciation for the civic virtues that support liberal democracies in primarily Judeo-Christian countries. If we admit Muslims freely and allow them to vote, they will become too powerful and we will end up less free - or not free at all."
I don't believe any part of that is true, but let's suppose that all of it was. What's a liberal democracy to do?
I argued earlier that the way to promote the virtues that support a free society is to practice (and test and defend) them, and that practicing them is done by standing up for one another. If it is to be meaningful and robust, liberalism must be a fundamentally cooperative and inclusive exercise.
If we make concessions that allow infringements on the liberties of others, however targeted they may be, we erode support for the values we claim we're trying to save. If our liberal institutions are in danger, we are making them more vulnerable by allowing targeted concessions.
If the laws and values of a liberal society are not robust to the challenges presented by a specific group, they are not robust at all. Those who are willing to make exceptions because of one perceived threat open the door to others. They should not be surprised if they are blindsided - perhaps by those they empowered to make their exceptions.
There is no quick and easy solution. Liberty is a collaborative exercise, not a free-for-all. If we want to preserve the foundations of a liberal society, we must enforce them. The best, maybe the only, way to do that is to insist they are upheld consistently and for everyone.