I know would could confound them. Refer to the death penalty as “euthanasia.” Britain now annually murders some 30,000 of its weakest and least able to defend themselves adults through starvation, as well as a huge number unable to defend themselves babies in abortions, so why not add vicious murderers to the blend?
Say, “euthanasia for any criminal sentenced to over 30 years in prison”.
They could even advertise it: “It’s *not* capital punishment. It’s euthanasia!”
That’d take a redefinition of criminal acts as manifestations of a fatal illness, of course.
Like the "supreme measure of social defense" that Solzhenitsyn noted in the "Gulag Archipelago", when describing the death penalty for Stalin's political prisoners.