From this helpful summary of recent trends in US gun laws at Ammo.com:
After a wave of mass shootings in 2017 and 2018, one of the most fashionable pushes for gun control was the rise of so-called “red flag” laws, or Extreme Risk Protection Orders (ERPOs).
[. . .]
Red flag laws enable law enforcement to confiscate firearms from an individual who is considered a threat to themselves or others. However, these confiscatory actions can be taken based on simple allegations. An accusation from a family member, friend, or associate is enough of a justification for law enforcement officers to seize an individual’s firearms.
Potential for due process violations has emerged since red flag laws started gaining traction. Even the American Civil Liberties Union, who views the Second Amendment as a collective right as opposed to an individual right, has expressed concern about how red flags will essentially create Minority Report-like scenarios in America. Individuals could see their rights stripped just based on speculation on the part of petitioners and a judge.
Subsequently, the accused are compelled to take their accusers to court, even though the accused has never been charged with or convicted of a crime. To make matters worse, the defendant could have their weapons seized without even a hearing before a judge. Months could go by before a gun owner wins back his gun rights in court.
It seems likely that govt officials will use red flag laws to harass unpopular people. It seems likely that red flag laws will have perverse unintended consequences such as ex-girlfriend empowerment. Red flag laws will be enforced by the same institutions and officials whose inability to prevent or stop mass shootings is used as an argument for passing red flag laws.
In politics, if it feels good, if it’s fashionable, if it’s glib, if everyone seems to want it, it’s probably a bad idea.