The whole point of fairytales is to teach children the value of thinking logically, and what happens when you don't. Besides, the King was suffering from well-placed guilt at the time. I mean really, would YOU want your wife and your ex, in the same room, at the same time?

As a Disney version of a classic fairy tale, Maleficent was no more illogical than previous fairytales. It also teaches little girls to not trust the smooth talking cutie. Far more succinctly than The Little Mermaid or Beauty and the Beast.