As US reels from multiple mass shootings, can loneliness be a trigger for violence? - WEIS

(NEW YORK) -- There is a loneliness epidemic in the United States -- and it experts told ABC News it may be triggering violence. In California, there have been three shootings in as many days, tied to a perpetrator who may have exhibited signs of social isolation and/or violent behavior, according to authorities. In Monterey

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