A little help for the Monday night quarterbacks here.  First, there is no way to predict dangerousness.  We can identify risk, we cannot predict when a dangerous act will occur.  Each state has laws regarding involuntary commitment.  Most all center around "imminent danger to self or others."  That usually means someone has communicated a threat, has a plan to harm or has acted on that plan.  It is not applicable just because someone is delusional (e.g. paranoid and thinking that someone is controlling their mind).  The law does not permit forced hospitalization just on that alone.  Nor should it.  There are thousands of persons in the state on any day who are actively hallucinating, paranoid, and have grossly disorganized thinking; they are psychotic.  As a society, we opted to dismantle long term stay state psychiatric hospitals decades ago and turned them into short term treatment facilities.  Psychiatric admissions are often two weeks or less in duration.  That is what we have.