"because of Napoleons ambitions" - it is pretty unfair to lay the blame for the wars solely on Napoleon. The wars started because the monarchies of Europe ganged up against France after the revolution because they saw France was weakened and they wanted to prevent the ideas of the revolution to spread. Napoleon rose to prominence during these wars but just happened be be an extremely successful general. When France started winning, the propaganda of the monarchies like England painted him as a "madman" who wanted to "conquer the world", but from the viewpoint of France these were defensive wars.

Of course England at the time was fighting merciless wars of conquest all around the world in building their colonial empire. So they couldn't claim there were anything morally wrong with conquering the world. Instead their propaganda focused on the fact that Napoleon was a commoner rather than of old royal stock - something which was both offensive and scary to the old monarchies.