"Like so.many other topics, this is more complex than we outsiders appreciate."
Very true. But some will still wish to argue! And sadly some will only believe what they want to believe. With the increased terrorist activity of recent years I would be surprised if we knew a fraction of what checks really occur. It certainly can go far beyond a uniform in a booth scanning passports, no matter what our resident self proclaimed experts may say.
   After all a half century of experience can mean repeating one year of experience 50 times.

"You have the official vesrion Iains and you chose to ignore it"
Twerp!!