Do you think it is beneficial for criminal justice professionals to agree that crime is “functional” in nature?

No! What a strange idea!

http://books.google.com/books?id=2l36DmN5r10C&pg=PA2&lpg=PA2&dq=crime+is+%E2%80%9Cfunctional%E2%80%9D+in+nature&source=bl&ots=bD6cRtZOo7&sig=1qiNPuAh0GNXm-9GdLFSnybBN98&hl=en&sa=X&ei=YjGPT6blMYbS2AWq2rWaDA&sqi=2&ved=0CCUQ6AEwAQ#v=onepage&q=crime%20is%20%E2%80%9Cfunctional%E2%80%9D%20in%20nature&f=false