Dying and killing are two different things.
Right and wrong are two different things.
"Legal" and morally legitimate are two different things.
"We should never forget that everything Adolf Hitler did in Germany was 'legal' and everything the Hungarian freedom fighters did in Hungary was 'illegal.'" -- Martin Luther King, Jr., Letter from a Birmingham Jail
These people are insane, and I mean that in the clinical sense.
The main characteristic of insanity is the inability to make appropriate distinctions between right and wrong.