The problem about Red Flag laws is that they can readily be used as a step around the 5th and 14th Amendment Rights, and leave the accused essentially no recourse before being deprived of their property without Due Process of Law.
For a corrupt police department, they represent a fast means to enhance their private collections and make money, and if the person is cleared, when they attempt to get their firearms back, some or all of the best will have been lost, and likely, what IS returned will be damaged.
If we need to find a way to stop mentally disturbed persons from acquiring or having firearms, that is not it.