Napoleon was not an aggressor except against Russia and arguably Spain. In the other cases, he did not start fights; he finished them.
And he was not an aggressor at all against the peoples of Europe. He was an aggressor against the deeply conservative feudal nobility who were enemies of progress, reason, and efficiency. Napoleon was far more rationalist and humanist than everyone he fought against, except Britain.
“When I was in college, I was mugged. A few evenings later, I was hanging out at my friend S’s house, and it was getting late. My friend W was about to leave to walk home, when he remembered the mugger. Enjoying the feeling of being a bit scared, he decided he needed to be able to defend himself. “C’mon, S,” he said, “You’ve got to give me something! I can’t go back without something to defend myself.” Eventually, S scrounged up a hammer. A hammer is not a weapon. And it’s not a good idea to defend yourself from a phone theft with a hammer anyway. A stolen phone is a cheap price to avoid prison time and mental scarring.”
I realize this is an analogy, but several points about this:
Anything that can be used to physically harm someone is a weapon.
You are allowed to use force to defend your person or property. To the extent this right does not exist in reality, the relevant laws should be changed and officials replaced. In Texas, outright deadly force may be used solely to prevent loss of property; other states would be wise to emulate this.
You are also allowed to perform a citizen’s arrest when you witness a felony (such as someone trying to rob you) and use force to effectuate same.
Your attitude is a defection in the prisoner’s dilemma of violent resistance to criminals. If everyone refuses demands from muggers and attacks them, being a mugger becomes a very bad decision. It is precisely because people comply with their demands that muggers exist.