Well, he didn't have a reason not to mow his lawn.
However, the police arriving complaining about his lawn when everything else looked like crap was a bit hypocritical, don't you think?
Anyways, I actually like the tall grass, makes everything look exotic. Besides, it's his lawn, wtf should anyone else care what it looks like? It's none of their business... But public property is the city's problem, and the city wouldn't take care of their problem, instead order someone else to take care of his problem, then continue on like they haven't got a problem.
Cheers,
-naota