My guess is that some people may feel differently if he had held a gun to their son, daughter, spouse, or parent's head kidnapped them and forced them to drive him around in their car OR if it was their loved one behind the counter of the convenience store whose life he threatened while robbing the store of $300.00. And they learned that he had prior felony convictions on his record for violent crimes before holding the gun to their loved ones head. But that's just a guess on my part, some people may be okay with that.
What got Skip the life sentence was not one or two occasions of criminal conduct or one or two crimes. Skip got the sentence he did because of his collective criminal history and the fact that he exhibited a pattern of increasingly violent crimes. Ultimately he committed a capital offense with a firearm.
The 25+ years in prison, that is the collective amount of time he has spent in prison for ALL his crimes, not just his most recent crimes.