Concurrent Sentencing

I have noticed a lot of cases coming to court lately where criminals have committed a multitude of offences and end up being sentenced concurrently. This means in effect they only serve the longest of the several sentences they are handed down. And then of course they are out after two thirds of that under the parole system. This is making a farce of the justice system. I say no more concurrent sentencing, I like the US system if you kill 5 people you get 5 life sentences, meaning you will never ever be out of Jail, In New Zealand under current law 5 life sentences at the maximum is still only 85 years... Yet this is more than fair, if you commit multiple crimes you should serve the sentences for every single one of them.