Trouble is, it is not possible to run a test, because there is no way of knowing what would have happened if capital punishment hadn't been abolished.
Certainly, Killings/Murderous_Assaults are occurring today under circumstances that simply didn't happen back in the 60's, despite the fact that Guns were much more readily available and every Schoolboy had a Knife (And many Schoolgirls too)
There is a sense that life is much cheaper today.
Even if the impression is an incorrect one, there is very much the impression that, While back in the 60's Murder=Gallows (Even if it mostly didn't) Nowadays, especially amongst younger people who have no cultural memory of the Gallows. Murder=out in a decade or less (Especially if you are a "Youth")
Also the most recent data I can find says there were 518 homicides (2015), it peaked in 2002/3 (1041) and has been declining since.
I admit I was taking something of an extreme. but even if only a small part of the increase was due to abolition, the numbers of innocents killed would still outweigh any number of wrongful executuions.
(And in any case, many of the supposedly "Wrongful" executions in the past or which might occur in the future are arguably on mitigating factors rather than the facts of the crime. EG Craig/Bentley. If Craig had been a bit older both would have Hanged and nobody would have cared!)
But the relevant figure to my mind is not the actual number of deaths, it is the number of "Murderous Assaults" (For which no clear figure is provided) Medical intervention is
far better than it was in the past, even over the last ten years I would expect that people survive today who would not have done so 10 years ago.
Suggesting that the country is somehow a safer place and that the Murder rate has fallen because the victims of murderous assaults now get better medical treatment is a somewhat misleading argument!
