The death penalty

Is the death penalty appropriate for the sexual assault of a minor?  And what about the death sentence for the killing of police officers or other public figures? 

What about the death sentence for Dzhokhar Tsarnaev, the Boston bomber found guilty in court for the act of planning and executing terrorism in Boston?  The Jury sentenced Tsarnaev to death.  The death sentence has been appealed by his lawyers.   What would your sentence be and why?   News item on the case: LINK (Links to an external site.).

Or Dylann Roof who prayed with the congregants in Mother Emanuel Church in Charleston and then killed 8 of them?

Are there some cases in which you would approve of the death penalty?

Reference:

https://www.youtube.com/watch?v=r-KzrRryvQc