On the Centenary of the Formal End of WWI, This Thought on Nationalism

Nationalism led to the Napoleonic Wars, killing over 4 million people.
Nationalism led to World War I,
killing over 10 million people.
Nationalism led to World War II,
killing over 60 million people.
And yet, some people in some Europe countries still stoke
the ideology of nationalism.
To what end?