If you're unconscious,, first responders can remove anything from your person they think helps with their job, and that would certainly include securing a gun. And they can certainly refuse to treat anyone who is conscious and armed and refusing to give up that gun. They probably thought it was the cops' job to secure the weapon.

But yeah this is why first responders shouldn't be dealing with scumbags. I dunno how you tell, but there needs to be discretion.