concrete5 fileset deletes

<?php /* totally not safe for work :) */
defined('C5_EXECUTE') or die('Access Denied.');
Loader::model('file_set');
Loader::model('file_list');
?>
<form method="POST">
<?php
if (!$_POST) {
    $s1 = FileSet::getMySets();
    foreach ($s1 as $s) {
?>
    <div>
        <label><input type="checkbox" name="sets[]"
            value="<?php echo $s->fsID; ?>" /><?php echo $s->fsName; ?></label>
    </div>
<?php
    }
?>
    <input type="submit" />
<?php
} else {
    foreach ($_POST['sets'] as $fsID) {
        $fs = FileSet::getByID($fsID);
        $fileList = new FileList();
        $fileList->filterBySet($fs);
        $files = $fileList->get(1000, 0);
        foreach ($files as $image) {
            $image->delete();
        }
        $fs->delete();
        echo 'Deleted: '.$fsID;
    }
}
?>