Have a montly Coliseum Contest. By lot, choose two each month and let each as enters the “Coliseum” only one leave. Good luck, gentlemen. May have to weekly until the herd is culled.
Not my choice of a solution.
The only problem with the death penalty is the FACT that prosecutors,judges,and juries are human and sometimes wrongly convict for reasons of bias,career,poor judgment,and laziness.