There's two categories of burglars: those that are clever and those who actually are impulsive, indiscriminate, and opportunistic. To group them all together is really untrue else "crimes of opportunity" wouldn't be a thing.. I've seen cases of some really dumb and obviously unplanned burglaries - including the time my own house was burglarized. I've seen even dumber petty thefts - those that were impulsive, indiscriminate, opportunistic to a T. Example: a friend of mine had a bottle of Gatorade stolen from her car but the robber left the cash in the (unlocked) glove compartment.