Look guys, we are not going to get into the politics on one side or the other of this here on SD.
Each nation has a right to determine for itself what it thinks is or is not a security risk.
What one may call absurd, another may have very good reason for.
When you have tens of thousands of fighting age males coming into your country, and they are coming from a place where a horrible civil war is going on, and where the likes of ISIS and Al Queda have indicated that they are willing to infiltrate the refugees...and you have no way of vetting the ones coming into your country...well, then each nation has a right and a responsibility to determine what they are willing to accept.
Both ways.
The people making that determination are the elected officials, or those appointed by them.
If the people of a nation feel they are choosing wrong, then they have the opportunity to address it at their elections.
The UK has made a determination, and as I said, I cannot and will not blame them for it.
There have been studies where security professionals have estimated something that up to one in one hundred of the fighting age males could be infiltrators.
If you are bringing in 100,000 such individuals, then there is a chance you may be bringing in up to1,000 amongst them.
Heck, in a western society like the UK, Germany, the US, etc. even 100 such individuals (that's now one in a thousand)...if they came in and you did not know who they were...even 100 could cause untold mayhem.
So, nations make determinations based on what they are willing to risk.
I will not blame a nation whose elected individuals make such determinations based on what they believe is best for their nations. Germany has decided one way...which is their right. the UK has decided something different...which is their right.
As I say, if the people in those countries (or others) feel it is wrong, one way or the other, they can change things in their next election cycle.
It's how it works.
But we are not going to get into a political or cultural argument here about which is right. Or call them, or those that support them (on either side) absurd, stupid, foolish, or whatever else based on our own feelings in the matter. That will only lead to arguments, pointing fingers, etc., etc.