It's possible to have both, TTT. I don't think there's a single one of these "Why is the sentence so short?" posts where a part of me hasn't agreed with the outrage. But another part of me accepts that sentencing follows guidelines that, to some extent, *have* to be dispassionate.
It's probably important to preserve the principle that guilty pleas lead to some reduction in sentencing, because if it made no difference then the particularly malicious might just allow a lengthy and possibly painful trial to go ahead, time after time, even knowing that they'd lose, as some last twisted act of abuse of the victims and their families. I'm not happy about it, and I've no doubt that Islay is the same. But the rule is in place for a reason and no matter the disgust at the criminal and his awful crime, that reason remains.