@Walter Hinteler,
Therefore, there will most certainly be a hard border established between Eire and NI. They can and will hopefully try and make it as smooth and gentle as possible, but with ID checks. Otherwise any EU citizen will be able travel to the UK unchecked, through Ireland, thus defeating the very purpose of Brexit.
I feel for the Irish, I really do. But pagmatically the choice is between the following options:
1) the UK keeps some access to the common market AND a hard border is set up in NI;
2) the UK crashes out with no deal and can only access the common market under WTO rules AND a hard border is set up in NI.
I prefer option 1, to not disrupt the economy too much.
I think Ireland should realize that it cannot keep a smooth, unchecked access to the UK after Brexit, because that would render Brexit meaningless.
I absolutely hate to agree with the Johnson, but logically speaking, it's time to drop the backstop.