This is a massive Chillul Hashem. First perpetrated by the Frum community here in NY, then by the community in Belgium and then by him.
I make a Machoh here in public that noone has the right to take revenge on s/o’s kids because of the parent’s actions.
There is always exceptions -like where the parents will move out of town when they are suspected criminals, if you deny access to the schools for the kids.