What happened?

A former neighbor of the young man who went on to kill 17 people at a Florida high school says the warning signs were there all along – and police ignored her when she asked for help.

What did she say?

“I had no doubt he was going to do this,” Joelle Guarino told CNN. “My husband and I both knew that we would eventually see him one day on the news, wearing an orange jumpsuit being charged with murder.”

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Guarino claimed that the eventual shooter’s behavior escalated from hurting other kids when he was a child to destroying property and killing and dissecting small animals. After a post where the teenager said he would “shoot up a school,” Guarino called police. She said she was told the authorities couldn’t do anything “until he does something.”

Glenn’s take:

On today’s show, Glenn and Stu talked about this story, which is only the latest red flag that should have warned law enforcement that the teen was dangerous.

It’s ironic that the Florida school shooting has ramped up the gun control debate when it was so clearly a situation where law enforcement failed.

“One of the strangest things about the movement in the gun debate on this particular shooting is that it is – I think maybe without a doubt – the most preventable shooting we’ve ever seen,” Stu said.

“There are things we can do, and this one was so preventable,” Glenn said. “Can you arrest somebody who has this track record? … The answer, is ‘yes, you can.’”

EDITOR'S NOTE: This article provided courtesy of TheBlaze.

This is a rush transcript and may contain errors.

VOICE: Another school shooting.

VOICE: The gunfire lasted less than 10 minutes.

VOICE: Heavily armed with a bullet-proof vest, loads of ammunition, and a powerful AR-15.

VOICE: Another debate about banning guns.

VOICE: Keep assault rifles out of the hands of people who are going to shoot our kids.

VOICE: I want this to be the catalyst, the end of the Second Amendment.

VOICE: Now, more than ever, you need to know the facts. Get Control: Exposing the Truth About Guns on Amazon and wherever books are sold.

GLENN: Dick’s Sporting Goods has just made the decision that they’re going to ban all assault rifles. We’ll give you all the details on this, coming up in a second.

STU: One of the strangest things about the movement on the gun debate on this particular shooting is that it is, maybe without a doubt, the most preventable shooting we’ve ever seen.

GLENN: We’ve ever seen.

STU: I’ve never seen anything like this. The amount of information that keeps pouring out. Let’s listen to the gunman’s neighbor. I mean, listen to the people talking about this guy. You know that people knew this was going to occur.

VOICE: My husband and I both knew that it was not over, that we would eventually see him one day on the news, wearing an orange jumpsuit, being charged with murder. We both knew it. I didn’t know exactly how it would happen or how soon it would happen. But I had no doubt in my mind that it would happen.

VOICE: You begged this officer to do to please do something.

VOICE: I did. I did. I begged him. And he basically told me that it was not an immediate threat. He couldn’t do anything is what he told me.

GLENN: See, this is a problem.

VOICE: I remember him leaving and thinking, my God, he’s going to kill someone, and I can do nothing about it.

STU: Ugh.

GLENN: So here’s the problem with this, this, I believe is where the average American is. That’s not engaged in the rhetoric of the left or the right right now. They are saying, my kids are in danger. There are things we can do. And this one was so preventable. What are — what are you guys talking about? Is this happening in my town? Can you arrest somebody who is — has this track record? And the answer is, yes. You can.