You keep asking why the UK should abide by rules without a say
Can't see why the UK, or any country in the World, should be governed by policies it has no say in. One the reasons WA was rejected was that UK would be governed by EU rules,, but without a say in how such rules could be made.
the majority are not terrorists
Nobody has said otherwise.
acted, and continues to act, in a way that is likely to result in an international peace treaty bei g broken
It takes two parties to agree a deal. Nobody enters negotiations on the basis of cant leave the table until a deal has been made. Once the other side knows you are desperate for a deal you end up with the worst imaginable.
WA was a prime example. It was so bad that T May attempted to hide from MPs the legal advise given by Cox. When it was revealed that the WA could result in the UK being tied to the EU forever. Even remain supporter MPs voted against the WA.
Your post of 25 Aug and those of others refer to minority terrorists groups in North and South that may resort to violence no matter where there is a border, in the sea or on land.
ROI agreed to Article 50 that recognizes the possibility a member may leave without a deal. British Irish council did not follow their duties described in the GFA.
UK has said they won't install a border between NI and ROI. WTO has said they will not require ROI or UK to install a border as WTO is silent in borders.
If ROI chooses to install a border in accordance with EU regulations that represents a breach of GFA by ROI as opposed to the UK. However, my view that the GFA will become void unless it amended in advance of a no deal scenario.
NI only backstop or NI being a special economic zone changes the status of NI and would have to be agreed by consent. DUP argue that it would contravene the GFA.
Norway model requires border control too. Norway plus requires some form of customs union and single market which is the same as what UK has now. So in effect payment of £39 billion is to remain.