For me, Red Flag laws are at the top of the discussion list. When I think of Red Flag laws, I think of the dude who shot the Nashville area Waffle House up (killing 4 IIRC) His guns had been taken from him in Illinois after a series of incidents, but law enforcement gave them to his dad, who in return gave them back to him. This dude had more Red Flags than a Donald Trump loan application, yet was able to get his guns back, and for an encore, killed those people. FWIW, his dad was sentenced to 18 month in jail in 2022 and is probably still there. Red Flag Laws should have seen his guns taken away and never returned and prevented him from ever being able to LEGALLY purchase another.
en.wikipedia.org
The second Red Flag story that comes to mind when my former coworker shot two Kingsport police officers who came to his house for a disturbance with his neighbor. He retired a couple of years before I did, but I hadn't talked to him until he came to a retiree picnic. The former slow talking, level headed country boy was now a ranting, obviously troubled man. His voice was even different. He ranted on about the Bible and end times, talking so fast it was hard to keep up with him. We were like WTF? and a few laughed about it when he left. A couple of weeks later, he was on the front page of the local paper for what was his second stalking charge. Earlier that year, he had been arrested for stalking and ordered to undergo counseling. Now he was charged with aggravated stalking and was scheduled to go to trial. A couple of weeks before his trial, he got into an argument with a neighbor. The neighbor called the cops. The cops were walking up to his door when he stepped out and pumped multiple rounds from a 12 gauge into them. One officer was treated and released, but the other was seriously injured and required several surgeries. He then barricaded himself in his house, and after a standoff, shot and killed himself. If they had taken his guns after the first stalking charge, he may have still killed himself somehow, but those officers wouldn't have been shot.
Third (and I'll stop there) Red Flag case was a coworker of my niece in VA. She was leaving her abusive husband and had gotten a restraining order against him after he told her he'd kill her and her mother if she left him. As usual, the restraining order alone was worthless, as he kept his promise to kill her and her mom. I suppose he could've found another way to kill them but having access to his gun made it too easy.