Confirm/Deny: Not all model events fired on magic_getter->delete(); (Sanity check)

Can anyone explain why this:

$parent = Parent::findFirstById($id);
$parent->getChildren()->delete();

WILL NOT fire a beforeValidation() event...

as this does (tested):

$parent = Parent::findFirstById($id);
foreach( $parent->getChildren() as $child) {
    $child->delete();
}