So are you saying that a retrospective full life sentence should be imposed?
Along with many other people like him that have committed horrific crimes?
The problem is with that thinking is that there are people who have been wrongly convicted who would have never been allowed to gain their freedom.
There is no perfect system, but to allow that system a chance to make a periodical judgement and hold it accountable is a far better thing...
After all, you could find yourself facing such an injustice...
Of course you'd deny that could ever happen, but it has been done to many innocent people in the past!
The knee jerk reaction (which I have in the past in part agreed with) is to have convictions where 'life means life'...
But it has to be done at the time, and with the chance to appeal at a later date given evidence that may have not been available at the time...