At the end of the day it wasn't murder.
Law of the land states different things for murder/manslaughter. Doesn't make it any better mind.
My first role in the job I'm in involved walking from the nearest train station, past the house to the office. I used to think it was simply a childminder or something as you'd always see open curtains, light on (at 0730) and a ruck of kids + minibus.
I soon learnt the true story.
To then have to walk past that house every day and see the police cordon, the flowers, investigators etc was hideous. Much more so to find out that Mr Philpott was to blame for it all.
The death penalty would be too kind on idiots like him. As long as in 15 years time (if released) the law has changed to stop protecting these monsters (i.e. the Bulger killers) then perhaps justice will be served.