Seems Jihadi John's victims families agree with Corbyn, it's good that he was killed but it would of been better for him to face justice in court.
"Reg Henning, the brother of victim Alan, said he was 'glad to hear [Jihadi John] had been killed, but would have preferred him to have been brought to justice'"
http://www.bbc.co.uk/news/uk-34814381