Why did France abolish a dictatorship in Louis XVI and then setup another in Napoleon?

first off the people of France during this time for the most part adored Napoleon, he was a very charismatic person and hingly brilliant. its easy to see why he was allowed to stay in power. and for the most part he was a great leader of both the army and the people of France. i know i will be tormented by others for saying that but he truly was. he put many bills into place that had a very positive effect on the country, he also turned France from a world power to the world power and of course every one knows his military successes and failures so i have no need to go on in that regard. this of course is a very simple explanation but one that holds firm. brilliant men/woman can easily grab power through manipulation and simply by being charming.