"...there's always guillotines."

In museums? The National Socialists executed 16,500 people using the guillotine including Sophie Scholll and members of the White Rose resistance to the Nazis. The East German Stasi used the Nazi guillotines for secret executions of political prisoners. The French used the guillotine on countless FLN rebels during the Algerian War (1954-1962) when they were done torturing them. Even during the French Revolutionary Terror, most of the people who were decapitated were commoners who had more than one loaf of bread or were guilty of other heinous crimes against the revolution.

In any case, people might just have to slake their thirst for the blood of the "very rich" by shooting them with a gun. Of course they will be shooting back.