The Isle of Man has knack all to do with it, you don’t even seem to understand that it has free trade with the EU and U.K. due to protocol 3, which formed part of our original agreement to join the EEC back in ‘73, and when we leave that protocol goes with it, so they’ll face controlling their points of entry as well. So you posting about it as if it has some form of relevance to this discussion is a total red herring.
The EU aren’t causing the Irish border issue ffs, we chose to leave, and if we leave without a deal and on WTO terms then we’ll have to protect our borders or face sanction from the WTO. This is very much a U.K. issue and Brexiteers trying to shift blame to the EU are solving nothing and are, as per, being completely disingenuous.