"You have grasped a big truth, which is that the winners decide the rules."
No, that is not a big truth, it's transparently obvious to GCSE students. And, as is pointed out in your next sentence, it is also fundamentally flawed.
"Most most fortunately for all of us who live in the West and rightfully regard 100 deaths a day as reprehensible. Quite normal though for warring Arab Islamic sects. "
...which is why we need the international law you seem to despise so much. If you do find someone to help you read Glover's book, you will find that it is about developing a meaningful code of ethics that would support international law and not be dependant on the vaguaries of 'winner's justice'.
"Left to you, that would be Britain in 50 years time. "
Why not do a search on this site and see if you can find a single post from me that would support your view that that is what I would like to see?
Good luck.