Yes indeed, What you saw on the BBC, is an everyday event at Miami International. From Passangers luggage be stolen, to stealing $100K parts from aircraft. The sad part about it it mostly people who work within the airport who comit crimes.
Theres a lot of construction going on around the northside of the airport with a new runway been built and new buildings etc....
So its easier for people to come and go take what they can sell.
And as for security around the airport lol...