Besides the logical "sending a message" reasons other's mentioned, I would also like to point out that dictators, crime lords, and other "strong man" types are

Besides the logical "sending a message" reasons other's mentioned, I would also like to point out that dictators, crime lords, and other "strong man" types are often acting emotionally rather than rationally. Navalny crossed him. Of course he had to die. Pride would allow nothing else. One of the greatest features of western democracies is that our political losers, who came at the not-a-king and missed, largely still die of old age in bed surrounded by loved ones.