You don't hear about many because they don't want idiots like you playing 'copy cat'.
The kids at Sidwell School are children of politicians and diplomats.
The school is likely a #1 target for many extremists.
And if you're stupid enough to believe your children require the protection of the President's children, you're likely to be a dues paying member of a hate group: the NRA.
Seems Sidwell is quite popular with Presidents and other pols.
"" Both of United States President Barack Obama's daughters, Sasha and Malia, attend Sidwell, which has been described as "the Harvard of Washington's private schools". Vice President Joe Biden's grandchildren also attend the school. Previously, President Theodore Roosevelt's son Archibald, Richard Nixon's daughter Tricia, Bill Clinton's daughter Chelsea Clinton, and Vice President Al Gore's son, Albert Gore III, all graduated from Sidwell Friends.""
Armed guards does not equal secret service.