Come on you're better than that. You dont think you'd need to look into the reasons behind that statistic rather than just jumping to the conclusion that the justice system is soft on murderers?
For example, an elderly partner providing assisted suicide to their terminal partner is charged with murder, but the mitigating circumstances mean they dont get a whole life term.
What about a person who has had a life of physical and mental abuse from their controlling partner, who snaps and murders them.
Over half of murderers released from prison have served between 11 and 18 years in custody.
fullfact.org
Plus even when released, they are on licence for life so can go back to prison at any time for breaking their parole conditions.