What the article doesn't mention is that on average, hybrid owners tend to live in large cities, where they are more prone to accidents and tickets. This is probably true for any vehicle. It's not the drivers per se.
Either way, the insurance companies are correct in saying that, on average, if you have a hybrid that you're more likely to get into an accident.
Perhaps it would be more fair to see where the hybrid is driven (city vs rural) when assessing risk.