In that case, the neighbors file a complaint, the DA goes to court WITH the gun owner’s lawyer and the insane neighbor is put on a 72 hour psych hold while he is interviewed by a qualified psychiatrist. If he’s determined to be a danger to himself or others, he is committed for treatment. During this process he is in custody and has no ability to harm anyone. There is no need to confiscate his guns.
The way it works, is once the authorities get their hands on a person’s guns, it’s almost impossible to get them back. The owner has to spend thousands of bucks on legal fees and months or years in court proceedings that may or may not be successful in regaining his property. Red flag laws are easily abused by spiteful ex-spouses, angry neighbors, irate ex-employees or abusive law enforcement personnel.