Well I think you are using a facts to fit the theory here. I see plenty of kids her age over here wearing clothing with that symbol on and I'm willing to bet that most haven't a clue what it signifies. I'm willing to bet Malia doesn't really know and if she does, she doesn't care. To her the t-shirt is just cool.
Seriously the symbol like many others has been hijacked by the fashion industry. I really think saying that Malia is wearing a CND T-shirt at her fathers behest is taking it a bit far.
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