The rub is, who gets to decide who is a danger? The psychiatric profession is loaded with lefties. They could easily decide that owning a “stockpile” of weapons, and posting on “racist, anti-government forums” (Free Republic) constitute a threat to others.
You are correct about the “deciders”. But, do we have to wait until an individual flips out and kills people to say institutionalization was appropriate? It just seems to me that the knee jerk professional decision is to put them back on the street and hopefully stay off society’s radar.