Because at his worst, Napoleon is still much better than the usual crop of dictators and has a legacy that shines brighter. More can always be said on the matter if anyone would like to address Napoleon; for the meantime, these previous threads should be of interest:
u/DonaldFDraper, our local Napoleon flair, has these relevant threads; I also recommend their flair profile for more Napoleon reads:
There's also u/kieslowskifan examining Napoleon's postwar popular remembrance.