In chapter 13 of our book, we thoroughly covered all things legacy with respect to dictators, from passing on your rule to suitable offspring to setting up monuments reflecting your glory for posterity. And much more -- including an idea that is unfortunately all too attractive to tyrants who are losing their grip on power. When that happens, tearing your world down around you as you fall, damn the collateral damage, becomes a way of spitting back at a hostile universe, one last time (for example, see the last days of Hitler as noted in Ian Kershaw's Hitler: 1936–1945: Nemesis, p. 785). Of course, this cements your legacy as a monster for the ages, but perhaps that's what many dictators aspire to in the first place.
Are there any recent examples? Maybe; certainly Bashar Assad appears to be inching toward armageddon, as recent reports indicating the use of chemical weapons suggest. It's hard to divine his motives, beyond mere survival, but it looks as if Assad may soon enter a downward spiral that will ensure his legacy is more than simply rotten. Perhaps he thinks 'monster for the ages' has a nice ring to it.