I do agree with you on that point. There is always a conflict between the generous impulse and the self serving... L. Cohen song put it neatly..". I will help you if I can, I will kill you if I must..."
The talk on local radio here, is that the terms of a future trading arrangement of EU/UK will be so fraught with local issues, that the British will look back with nostalgia at the simplicity of the withdrawal agreement, where they had only one group to negociate with. I did suggest perhaps a 1000 posts back, that any country with any axe to grind with the UK (and there are many ) would be revising them... . Perhaps the Danes will want compensation for the totally illegal attack on their city by the Royal Navy in the French war of 1810..., Or the French seeking the recovery of a few Islands they call the Ils Normand , which are certainly not in the English channel, or as now appears, the Spanish with Gib.
Many of these are grandstanding,and will not be resolved but they are wearing .