I’m sure that everyone is very sorry for the reduced tourism for ROI. The EU played no part in U.K. ROI relations, and the EU suffered no deaths or bombings as a result. Why are you worrying about Lithuania, Spain, Poland, Romania and Greece borders, all of which are porous, or are you so conditioned by EU law that you have forgotten what your own country is about.
The U.K. will control its borders as it wishes, with immigration as it wishes, all of which can be done via a myriad of means. Your concern should be about the border in question yet you are going on about Farage and Spain and Romania. Forget them and their individual issues, concentrate purely on what you need in Ireland to make the people of Ireland safe and prosperous......