Fair enough, they aren't the same thing. Having said that, a couple of the Paris attackers were processed through Greece weren't they?
https://www.washingtonpost.com/worl...8a7231-062d-4185-bb27-cc7295d35415_story.html
I think "undesirables" has shades of desirability about them too though.
We can probably all agree that Jihadi terrorists fit the description of "undesirable", but how exactly do you screen these when they destroy all documentation and lie about their identities. The answer is to refuse transit, but that causes a log jam. So far as I can see though the points of arrival are processing them whilst encouraging them to leave the country concerned. I don't know the answer, but have we seen any terrorists arrested by Greece and Italy upon arrival yet? I seem to recall that during the debate about national ID cards the terrorist threat argument was exposed given that it was revealed that only a tiny fraction of terrorists are ever identified at border crossings, and that's when we're looking for them, as opposed to some over worked, ouzo swigging, redundant Greek fisherman manning the local police station, and just stamping papers.
"name?"
"Abu Mohammd"
"Ah yes another one. Country?"
"Syria or Iraq, which ever is easiest"
"Oh we'll go with Iraq this time. Here's your stamp, here's your map to Germany. And if someone wishes you 'good luck' don't say 'thank you' it doesn't end well"
There's also another issue of course about low skilled and poorly educated migrants. Do we say that someone becomes 'desirable' by virtue of not being able to prove that they're terrorists? I'm not so sure that we do. Naturally it leads you into points systems and key skill workers etc It's what the Americans do. They've taken just 2500 last time i checked (Nov 2015) but they're very carefully cherry picking them.
I can accept that bracketing these people as 'undesirable' looks callous, but by the same token they don't automatically become 'desirable' either. I can accept that countries like Germany who are experiencing population decline might need to look at this, but the UK doesn't. We're producing enough poorly skilled and badly educated of our own without needing to import them and then take on the costs of training them