For starters, this claim is a gross exaggeration:
For every nine people who have been executed, we've actually identified one innocent person who's been exonerated and released from death row. A kind of astonishing error rate -- one out of nine people innocent.
Yeah, I guess it would be, if it were actually true:
Since 1973, 144 people on death row have been exonerated. As a percentage of all death sentences, that's just 1.6 percent.
http://www.newsweek.com/one-25-executed ... ims-248889
(That article also talks about a study that hypothesizes that the number of innocent people sentenced to die could be as high as 4%, but the quote in that video transcript excerpt claims that the number "exonerated and released from death row" is one in ten, a blatant falsehood. And even the hypothetical four percent number is far lower than that.)
Mr. Stevenson appears to have pulled that one in ten number completely out of his, uh...hat...
If this quote is a representative example of the regard for factual accuracy that I can expect from the entire video, if I decide to watch it I clearly will need to put aside
a lot more time than 20 minutes...
I'll need at least two to three times again that much time for fact checking...
The excerpt you posted leads me to strongly suspect what I already kinda suspected...
That this presentation is long on impressive oratory and short on substantive veracity...
As for your question regarding what I would consider to be an "acceptable" error rate re the DP...
Years ago Andy H tried to pin me down to a number on that... (his clear intent was to get me to commit to a number and then somehow try to prove it was higher than that) I declined to fall into that trap then, and I decline to do so now...
I'll answer the question the same way I did at that time:
I am absolutely
delighted that modern scientific methodology has resulted innocent people no longer facing the DP. In my opinion these advances strengthen the argument for the DP, rather than weakens it because they assure that the execution of innocent people will be far lower than it otherwise might have been. (I say "might" because of course there is no study
proving that innocent people have in fact been executed in the US in modern times, there are only studies showing hypothetical models that suggest this to have been the case.)
I refuse to assign a percentage number to what I would consider to be an "acceptable" error rate in executions. I
DO NOT want innocent people to be executed at all. (Any more than I want any innocent person to be killed by someone on the highway.)
The number should as absolutely low as can be reasonably made possible, while still seeing that justice exists for all concerned parties. Today that includes using the full suite of modern forensics, including of course DNA testing. For years I have advocated that DNA testing be mandatory and provided at state expense in
any case where such testing could be dispositive in establishing guilt or innocence. (Not just DP cases; I don't want innocent people sitting in prison either.)