It can - it does and it has here
Sentence does not mean prison
You can be sentenced to community service for example
I think you mean why don't they get a full life term
There are a number of categories where full life terms are recommended such as serial killers or certain categories of child murder.
http://en.wikipedia.o...ales#Whole_life_order
In this case it doesn't look as if there was substantial premeditation of pre- planning.
He was robbed and went to pick a fight with them after (not bright but never mind)
Do you really want to put that crime on the same level as someone who abducts, rapes and murders a child?