Today, the death penalty has been abolished in almost all developed countries. The United States, Singapore, Japan, and Taiwan are the only industrialized, Western countries to still use it. In fact, abolishing it is a precondition to join the European Union, and abolition has become such a trend that two-thirds of countries in the world dont use it (though avout 60% of the world's population lives in coubtries where its used). The governments of developed countries tend view it as a human rights violation and protest its imposition on their citizens for any reason.
Your challenge is to make capital punishment a widespread, regular punishment still regularly carried out in the Western world and elsewhere in 2017, without any controversy whatsoever.