The reason I said leave it to the Irish @ UK governments is precisely that they understand the Good Friday agreement better that any EU person. With Ireland coming out of the dark ages and obtaining international business due to Brexit, it will not want to see that
Disappear due to terrorist action. This also applies to NI, the peace dividend brings new thinking all round and very few will be willing to chuck it away, when it was signed the old grievances were very much the main driver..
We have to have a mindset that suits living in todays times, and there lies the the main issue of today that technology,lifestyle is changing so fast, people have difficulty adapting to it. The Good Friday Agreement, EU principals and definitely the US constitution all need to be revisited.