I would be OK with a history curriculum that's accurate but, well, the victors write history so it's hard to know what was changed in order to make a country's history look good.
However, no country can move forward if everyone has a different idea of what it needs- otherwise, it's like someone poured a bucketful of ants on the ground without a queen. Constructive debate and compromise are needed, as well as some kind of common goals. This is different from hard core nationalism where everyone wants to live in a country that steamrolls its way around the globe.