I am afraid I cannot summon up any "revulsion over another botched hanging", a feeling which you say is "worldwide".
Iraq is still a long way from becoming a peaceful democracy with civilised executions.
However, the more people who are executed by hanging, the more experienced the practitioners will become, and the more expertly the job will be done. There is nothing more morally uplifting than a perfect execution, performed with grace and humility, allowing a dignified end to life.
Messrs Bush and Blair have started the democratic ball rolling. It is up to the Iraqi people to run with it so that they too can one day have a capital punishment system to be proud of.