I'd still think the judge can and should be able to use discretion and allow concurrent sentences.
Maybe the judge decided in this case that the sentences should not be concurrent. We don't know what judge had in their mind.
I hate to go all PC (I swear I am not one of them) but I wonder whether mandatory sentencing isn't all bad. Perhaps mandatory sentencing is the most effective way to bring down sentencing rules and guidelines to make them more humane.
This is getting a little off-topic but I don't have much sympathy for violent offenders (I'll lower the bar to those who actually commit battery or robbery as opposed to a threat). As far as non-violent crimes, especially victim less*, crimes go there should really be no jail time at all.
I don't have all the answers but I think we really ought to limit our criminal justice system. Specifically (sorry for going off topic) copyright and such topics should not belong to the criminal justice system. Let those be civil lawsuits between two private entities.