During the 1972 Games in Munich, Palestinian militants invaded the Olympic Village, killing 11 Israeli athletes and coaches as well as a West German police officer.
Neighboring countries' monarchs feared they would share the fate of Louis XVI, and attacked the New Republic, while at home, extremism and mistrust between factions lead to bloodshed.
The contrary happens in kingdoms governed like that of France, because one can easily enter there by gaining over some baron of the kingdom, for one always finds malcontents and such as desire a change.