Offloading liquor......why?

Why would the crew offload (stealing) aircraft liquor in spite of the risk of being caught and dismissed from the company?

In my opinion, these are the reasons:

• It's free of charge
• Easy access to the a/c bar
• Poor accounting practice
• Liquor is very expensive
• The crew is an alcoholic
• One could also sell them to a pub/bar at outstations (100% profit)
• The risk of getting caught is very slim ( less than 5%)
• It's convenient to put the bottles in one's bag than to go out to the shops and buy them (convenience)

How were the crew caught?

• Sometimes SQ arranges with the overseas authorities to let them apprehend the crew
• Other crew reported to SIA about the offloading
• Crew apprehended by custom personnel