Yes, that definitely was a blooper. But, hopefully the FBI Agent in Charge of the Parkland area office should be charged and fired. If the Sheriff's Department and Parkland police received calls, they get canned.
There is something to be said for responsibility and the Police have to follow the law.
The school, the owners of the house that he lived in, all showed lackadaisical actions. I have had guys stay my house from time to time, but no weapons unless I secure it. And, I do snoop. It is my house after all.
My brain is tired.