Should murderers be put to death? Yes, says Japan. No, says (increasingly) much of the rest of the world. Japan swims against the current.
The execution of criminals — not just murderers — was formerly, in Japan as elsewhere, a matter of course. The social order was sacred, no quarter given to the disorderly — a broad swath that might include thieves, adulterers, abettors of adultery, Christians, even persons found lacking in Confucian filial piety.
Beheading, as befits a sword-wielding nation, was the preferred method of dispatch, but crucifixion and burning at the stake were alternate possibilities. Executions were public. They were entertainment; they were deterrent. Severed heads were displayed for public gawking on specially constructed gibbets.