Um, the only Catholics putting forward "diversity of views" and "prudential judgement" on capital punishment are American. Successive popes, the world's bishops in union with each pope during his papal reign, and orthodox Catholics everywhere outside the United States of America (aka sensus fidelis) are pretty much unanimous in opposing capital punishment as retributive or restorative justice. (Of course there is a valid argument for self-defence, but these conditions are not met in modern developed countries which have the capacity to safely imprison serious and dangerous criminals).