If they're apprehended as illegal migrants, they can claim asylum.You seem to be missing the point that until they claim asylum - they are illegal immigrants with no lawful authority to be in France.
What do you care if they're in France, Greece, Spain, etc without the right documents?
You don't give a monkeys, until they arrive in UK, then you grasp at the slightest excuse to argue they shouldn't be in UK.
Why would France, or any other country worry about some migrants who are just passing through?But nobody cares because soon they will be the UKs problem.
It would be monstrous to imprison them, for just passing through.
I'm sure that if they were just passing through UK wouldn't be bothered.
But many do claim asylum in France, more than UK.
So we just pretend they aren’t here along with all the criminals that traffic them
The criminals traffic them because there is no safe legal route.
Round and round we go again.