I don't think it would prevent most of them. Not zero, sure. "If it saves one life then it's worth doing!" I hear you say. But no, that's wrong. Lowering the speed limits to 20 MPH everywhere at all times would save lives, but we don't do that. The costs would be greater than the benefits.
Gun licenses and background checks are already required. Red flag laws are, to put it generously, on very shaky ground with regard to due process. It sends cops to deal with the mentally ill. People with untreated mental illness are 16 times more likely to be killed by law enforcement
Don't like red flag? Fine. But make UBC and gun license requirements federal and you will save significant innocent lives, and despite your hyperbole will not cripple society in the same way slowing all cars to 20mph would.
What will expanding background checks accomplish? Flagging the mentally ill? Yeah good luck with that one flying in court. ---
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