How do you stop a toddler from dialing 911 and babbling gibberish to the operator, or a two-year-old from calling because he wants breakfast? You don't.
There are two types of criminals: the ones who know what they're doing, and the ones who always screw up, especially whenever they are questioned by police.
Some criminals just don't think. Most people come up with crazy plans to get away with their misdeeds, while others are just not suited for a life of crime.