TOKYO (AP) — He wrote that he intended to kill disabled people and that his plot would benefit Japanese society. The facility where he worked was so unnerved, it confronted him. He quit the job and police sent him to a psychiatric hospital, but doctors deemed him safe to release 12 days later. In the months that followed, his former workplace increased security, adding cameras to watch the buildings where 150 mentally disabled people resided. But he was left alone, free, unmonitored.