Napoleon crowned himself because he was the best suited to rule France. He took a top job without the permission or being of the blood and culture of the inbred, frequently depraved plutocrats.
These plutocrats all banded together and combined their armies and money and attacked him for around 15 years until they finally removed him from power. That’s what happens was someone who is not part of the club takes a top job.
Now the “history” that these plutocrats have crafted portray Napoleon as the eternal aggressor. Napoleon wanted peace. He wanted to be a king despite the fact that he was not born into that sick “royal” family.