Ex prosecutor Fujinaga in ‘97(日本の論点97)
“If the death penalty is abolished, criminals are not punished to death though they commit very heinous crimes.
So, the criminals easily try to shoot to kill police officers to avoid arrestment.
Police officers might feel empty to arrest criminals at the risk of their own lives and they might shoot criminals to kill under the guise of justifiable defense.
On the spot execution is often doen in nations that abolished death penalty like Germany and France,
and non-death penalty states in US.”
死刑は抑止力エビ CBSNEWS/09
What gets little notice, however, is a series of academic studies over the last half-dozen years that claim to settle a once hotly debated argument — whether the death penalty acts as a deterrent to murder. The analyses say yes. They count between three and 18 lives that would be saved by the execution of each convicted killer.