Crime, boy, I don't know. Locking up the Barksdale Organization didn't make a difference, because Marlo's right there to take over, and even more brutally. Lock up
Which leads to the season's true villain: statistics. Whether it's in terms of police clearance rates or students' educational achievement, what Simon and Burns want us to absorb is how much chasing the numbers can distract from, and often work against, the actual goals which the statistics are meant to measure.
Finally, Bubbs. Oh, god, it did get worse. Damnit.