....so K' is irrelevant?
In the larger scheme of things, yes, quite irrelevant. He is neither going to lead Poland out of the EU nor NATO, and his influence on Polish politics will end in a couple of months time when PiS loses the elections.
history school book
I haven't read the book, so I don't know what they opposed to, but in general it seems like a good idea to have such textbook.
we have not a less checkered past with France
Hmm... I'm not so sure. Did you murder 3 million French in WW2? Closed them in concentration camps and considered them Untermenschen fit only for death or slavery? Were there concentration camps for French
children like Kinder-KZ Litzmannstadt? Did you raze Paris completely to the ground and murdered 200,000 Parisians in the process? All things considered I wouldn't say your past with France is "not a less checkered" - it's a different category.