dont miss the point for them to be suicide bombers , our SSG always find it difficult to deal such situations , where the hostage situation involved and between them there is a suicide bomber , you have only one shot to kill him ...
i know this will not do much help , but there is a matter of security , its better than having nothing , if some male teachers do own a side arm than they probably give cover fire while the kids escape , even if few lives are saved like this , its better than nothing ..