If [google.com] you're putting someone out of their misery rather than yours, abducting [news.bbc.co.uk] and knifing [news.bbc.co.uk] them is not the way you go about it [walesonline.co.uk]. It's hardly a humane method and looks more like one of the many techniques used by evil "honour" killers - who really have no honour and care only about themselves and not their victim. Genuine mercy killings look entirely different (eg drugging and smothering).