City thinks post-Celtics rioters more likely to toss plastic Phoenix boxes than metal Globe, Herald boxes

Earlier this week, you may recall, Boston Police asked newspaper distributors to remove their boxes from areas where hopped-up Celtics revelers/mourners might be tempted to use them to put holes in plate-glass windows. The Phoenix reports the Boston DPW apparently thinks plastic boxes for free papers are more of a risk, because it sent crews out to remove them while leaving the potentially more lethal metal Globe and Herald boxes alone:

Can't people throw them through windows, as well? In fact, aren't their metal boxes more fun to throw through windows than our plastic ones?