Possible Clues:

• Their crime is to have cut away the tails
• Those at fault
• Perhaps thieves aim to break into money boxes, removing lid
• Miscreants offered proposals about goal
• Lawbreakers taking presents finish inside
• They do wrong to stop interrupting proposals
• Perhaps it's the dockers that are in the wrong
• They do the wrong thing concerning fireguards
• Dockers in the wrong?
• Perhaps dockers may be in the dock