The short answer is that the vast majority of people who suffer from schizophrenia pose absolutely no danger to anyone. However, as we all know from reading the papers, the very few who do harm people get huge amounts of publicity. So why do people with schizophrenia sometimes harm others (or indeed themselves)? Very often people with this condition, when they are untreated for whatever reason, live in a delusional world where they perceive lots of threats to themselves and their loved ones ...