You keep mentioning the suspension of the death penalty in England and Wales and the subsequent increase in crime after the war. Another poster has offered an alternative explanation for this which you haven’t commented on. You also haven’t mentioned what has happened to crime rates in England and Wales after the complete abolition of the death penalty.
Comparisons of homicide rates between countries is tricky
I didn’t compare murder rates between different countries; I offered a comparison of murder rates between different states- as in the United States of America. Perhaps you misunderstood my post. Could you say why there is such a difference in the murder rates between Louisiana and Maine, for example? (The former has the death penalty, the latter does not).
The murder rate in non-death penalty states has remained consistently lower than the rate in states with the death penalty, and the gap has grown since 1990.