When does a progressive activist become a regressive obstructionist? When they are called to testify before a legislative committee about what was going on — or not going on — in the back room of the Registry of Motor Vehicles in Quincy. That is where boxes of unopened alert notices of outof- state driving violations remained unprocessed for months, maybe years, including the commercial driver’s license for Volodymyr Zhukovskyy, the trucker who is accused of allegedly killing seven motorcyclists in a crash in Randolph, New Hampshire last month. Had the RMV acted when it was required to do so, Zhukovskyy...