Yes. But then again, so is virtually every other character in the story. Why doesn't Voldemort just walk into Hogwarts? If a first year could whip up some form-changing potion, why can't the "The Dark Lord"? Why doesn't Harry Potter just stab/shoot/poison/set fire to Voldemort? Bash him with a baseball bat? Why doesn't Dumbledore kill Voldemort, if he's so much more powerful?
Why does Harry always take ages to figure out obvious things? Why does he never tell Dumbledore - the wise, powerful good guy - when something ridiculously evil is going on? Why does he think it's smarter to keep it to himself? Why does he alienate his friends?