Quite right there is absolutely nothing wrong with a border, in fact, why wouldn't any self-respecting nation have strong border security, for example that between friendly neighbours USA and Canada? France, Germany, Austria, Poland, Sweden & Denmark have all recently suspended the Schengen (free movement) treaty, re-introducing border controls, with Austria recently deploying armoured vehicles to some border crossings. The terrorists involved in the 2015 Paris attacks moved at will across porous EU borders before and after the attacks that left 129 dead and 300+ wounded. The risk of such attacks taking place and succeeding is reduced with border controls.
What the British people weren't told by the deceitful Blair adminsitration about the NI/Irish border in the the Good Friday Agreement is this: removal of visible border posts and markings were a major concession to the IRA; the IRA could tell their supporters that they had won their 'war' resulting in the visible security presence and country markings being removed. This was positioned as being major progress towards a united Ireland.
For that reason, as well as prevention of people & drug trafficking, cigarette, weapons, explosives & laundered fuel smuggling, terrorism, tax evasion and other criminality the re-imposition of NI border posts is a good thing.
An added bonus is that nothing would say Brexit better to the EU than British soldiers at a number of NI/ROI border crossings on 30/03/2019, with weapons held in the high port position.
