So how exactly did you assume French didn't hate the English after that incident?
The problem in the current game is executing the French makes
The English (aka your friends) hate you. Which is dumb.
I agree it's done for balance reasons because the game uses Lords as the focal point for all game actions, without a system to replace fallen lords the player could end up with a very lonely world. But then they should just remove the option to execute altogether.
If the game gives you an option but makes the penalty for using it so severe you never use it, why even put it there?
This isn't real life, nor is it a representation of reality
This is the problem with arguing with people on the internet, they never try to debate your point, instead they argue something you never actually said.