Should Police bother with very petty offenses?

There are some web sites in the blogosphere where the author simply copies and pastes articles from news sites into his own. What does that really accomplish? Most of my journal entries report on my personal experiences. This morning I read an article in the New York Times titled
His Offense: Taking 2 Seats on a Nearly Empty Train by Jim Dwyer.

A man was given a summons for taking up 2 seats on an empty subway car at 1:30 AM. In the post 9/11 era I am always grateful to see a police officer in a train station or a subway car. A mass transit hub is a vulnerable place for a terrorist attack and a police presence certain thwarts a possible attack.

Customers on mass transit are often discourteous to their fellow riders. I see people hogging seats on crowded New Jersey Transit trains all the time, but the conductors rarely confront them. I absolutely hate when passengers block doors on subways and buses. This is a matter of courtesy, not a crime. I would much rather see police patrolling cars and stations to defer real crime.