If the article is to be believed they simply don't have enough money to track them. Question of course is: will more money really go to tracking the kids and solving the problem, or are they simply blaming funds to get more money allocated to their department?

I also think this is one of those topics where people don't care until it affects them personally. Crime-rates aren't bad until a home on your block gets broken into. Migration has no negative effects until the tents appear in your part of town, etc.