Red Flag = BS
A person can do more harm with a gallon of gas and a lighter, both available at any convenience store. Without a background check. People get angry for a bazillion reasons, it does not mean they are a threat. A person determined to be deranged should be put in protective custody after professional diagnosis, not the lay opinion.
Agreed, but that is the problem. Nuts cannot be "imprisoned" , meaning held without their consent, anymore. At least not until it too late.