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Like a hundred or so teenagers of whom a large part went to some regular school and had regular non-wizard friends would suddenly either completely cut off contact as if devoured by a cult or dead or the kids are assumed to just successfully lie about not being fucking magic.
It’s utterly ridiculous. Imagine if it was hidden from the Dursley’s somehow and that Harry spent summers there bullied by Dudley. That he would never snap and tell or do magic?
Or that people like Dudley would keep their mouth shut for their entire lives?
Nah.
No, there’s not. Harry thinks they died in a car crash. He remembers a green light, but he never imagined them getting gunned down on the street. The story doesn’t happen in America, remember?