I say its your computer and you have the right to put what you want on it. Besides you have other children in the house and if he was so careless to leave things open a child who is just hitting buttons could have easily seen things they shouldn't as well.
I would put it on the computer and tell him it's there. If he does figure a way around it or how to disable it then you need to take the computer away for good because apparently he's still going places he shouldn't.
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