should have capital punishment. Reason is very ovbious. While killing inocent people abroad if it have chance, why a country cannot kill criminal who commit capital crime?
If a country deny the capital punishment, I think the country have to abandon its army.
As to the possibility of false charge to the capital punishment, you can give 50 lead years to the guilty to hedge the risk.

In killing a police officer you are not only unlawfully killing a person (bad enough!), but killing the very people who daily put their lives in danger to protect the vast majority of citizens who are law-abiding. If you are willing to kill a police officer then I believe you would have no qualms over killing an ‘ordinary’ citizen; furthermore, I think a clear message needs to be sent out that the police do have teeth and can fight back (through the criminal justice system) and are not crippled by the ridiculous human rights legislation we suffer from currently.

For too long figures of authority (teachers, police, etc. and most especially parents) have found themselves weakened by human rights legislation and a softly-softly approach.

It could also be argued that for some criminals it is ridiculous to spend vast sums of money locking them up for their lives when that money could be better spent elsewhere. This is of course likely to provoke a vicious backlash from the Left, however the truth is that when an individual has beaten dozens of people up, stabbed people, raped women, mugged people, and is generally widely-recognised as ‘scum’-like, then I think it is reasonable to enter into a debate on how best to deal with such individuals.