There was a similar type of story here in Minneapolis. A group of people were stealing luggage from MSP. I don't think it was even close to what this couple did.
I have always thought how easy it would be to grab a bag and walk off. Especially the ones that hadn't been picked off the carousel and are stacked along the wall waiting for someone to pick them up before going to the lost luggage area.
There have been a number of times where I have taken a later flight due to bumping or voluntarily giving up my seat that I had to find my luggage "along the wall". I just walked over, found it and walked out.
It just shows that you NEVER put anything of value in your checked luggage. You can always buy new clothes but jewelry and personal items are far worse and insurance won't cover their true value.