I know, it can be frustrating at times doing the right thing instead of just lumping the f'ker, which would be cheaper and more expedient. Unfortunately, as social scientists will tell you this is the "retributive model of justice" not the "rehabilitative model". We have to let them go:
http://www.sfu.ca/cfrj/fulltext/charbonneau.pdf.
Indeed, I have a criminal operating from my address at the moment - but the police wont tell me his name, because his identity is protected by the Data Protection Act!!
This is not a joke! I have had police officers 'round asking me if I was the driver of a hit-and-run vehicle registered at my address!
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Do as you have been trained: remain calm and Do It Right - whatever you have to do.