What do these stories have in common?

* An 11-year-old is charged with setting fire to a shed behind row homes in Chester Township. The blaze quickly spreads to two houses, consuming one and severely damaging another. Police say the youth is no stranger to them. He’s been linked to several burglaries.

* In western Pennsylvania, an 11-year-old is charged with walking into his father’s bedroom, where the man’s pregnant fiancee is sleeping on the bed. The youth allegedly calmly walks up behind her, places a shotgun inches from her head, and pulls the trigger, killing her.

He then calmly puts the rifle back in his room, does away with the spent casing, and walks down the street to the school bus. He’s now under arrest, and authorities are trying to determine exactly where to house him. They don’t have a prison uniform that fits him.

* In Philadelphia yesterday afternoon, a 12-year-old is sitting in his car with his mother when another teen walks up and begins shooting. The boy is hit in the chest and hand. Police say he was the target of the shooting. The suspected shooter is not believed to be much older.

Three cases, three children who for one reason or another are involved in some seriously adult behavior. Criminal behavior.

I just don’t get it.