You claim that Merkel said
Said or not that was official stance of the German gov or at the least the massage they send out which reverberated in the German press. You know it and I know it. If you whish to play dumb go ahead. I have already said that I'm not going to participate in your game. You say I lie I say you lie. People here if interested can do the research themselves and decide for themselves who is right.
Since Greece did not control its external border properly,
They did. Until progressives started to cry about the fate or the poor refugees and some bad people staring to meddle and applying a pressure on gov's of those countries. Also lost people made money on smuggling those people in, Like all those 'humanitarian' ships and organizations in one or the other way part of the scheme.
How on earth could that have been done?
Easily, water barrier is not difficult to control given today's technology.