There are almost certainly at least a dozen photos which might be added to this list.
Christians should stop pretending that the Bible does not advocate death for such as he. Jesus Himself spoke of 'millstones'. His 'turn the other cheek' was for individuals and NOT for society - which in fact, 'bears the sword'.
Which is the more revolting? - To execute a Robert Black or to permit such naked evil to continue on this planet?