My wife and children, and my brothers in law and their families owe their lives to the fact that the decision was made not to prevaricate, as do thousands upon thousands of others in similar situations.
Read the history, check the facts and then criticise the decisions, rather than post up some ridiculous crepe about some obscure conspiracy theory. Check the facts yourself, Google Lisbon Maru, his name was Claude Elmy.
I had a grandfather on each side, one British and one Japanese so I can see your perspective. Luckily for me they both survived their respective ordeals. It is worth remembering however that although your father-in-law may owe his life to the decision ‘not to prevaricate’, hundreds of thousands of civilian men, women, and children died in his stead, vapourised, burned, or radiated to death.
Personally, I’d rather never have been born if it meant those bombs hadn’t dropped.