Going around knocking on people doors is far fetched, and i don't know why this is being exaggerated. Nothing was said about gathering up any crazy off the street, why is that statement being twisted?? The 2 particular crazies we know about had issues that couldn't be more obvious. Just because they are high functioning doesn't make them any less dangerous, that makes them more dangerous, living amongst the general public undetected by everyday people but known by Dr's and family members to dangerous. I honestly don't think an individual has to first commit an act of violence to be labeled dangerous if a Dr is telling the family, "Hey, your son is without a doubt a ticking time bomb and this is what I suggest, and if u don't, lives are at stake, possibly yours. His parent are also lucky to be alive.