You are never going to be right about anything if you actually think what you posted makes any sense.
If you only counted cases that meet the legal definition of the crime of "wage theft," the figure would much lower.
I'd also be interested to know what the crime they were trying to get a lead on was. If it's another case of minor tagging then I can empathize more with the concerns about the prosecution, but if it's something more dire then frankly using judicial leverage strikes me as entirely appropriate.
If someone gets stabbed outside my house every day with no charges filed, yeah im going to say spending resources prosecuting a fist fight at a bar is a waste of resources.
If he's an accomplice, them charge him with that, and turn it into a classical prisoner's dilemma. Don't just make up bullshit charges, that's abuse of the justice system.
In this case the person did a little more than Jaywalking so they're on the hook for more. It's also possible to have information on a criminal act or conspiracy without being an accomplice.
I appreciate the extremely... principled morality of some here, but the law isn't an ethical framework, it's a practical one informed by ethical principles. It's also not a computer program, people are involved who make decisions based on a number of factors ranging from professional and selfless, to careerist and selfish. That's life.
A really easy way to avoid all of this is to stay out of the system, it's not as though he's in for stealing a loaf of bread to feed his starving child.