It may be that the FBI dropped the ball but sometimes the FBI is between a rock and a hard place. An agent may know this person is dangerous but not have enough probable cause to arrest the individual or deny them of rights. Hard to tell from the limited information available to us. Balancing civil liberties against a concern for the well being of the general population is not easy.
Increased monitoring of this individual, and others, may have made a difference but may not have, it is hard to know anything for certain.
Unsupported, off topic, unrelated BS as usual. No reports say the FBI had anything like that.
We know what was reported. The FBI had chances (multiple) and didn't have any effect on the outcome. There has been no analysis on what ball was dropped, what people were involved, or what might need to change. What we do know is they were as close to this shooter as several other recent mass murderers and failed to stop the attack.
Maybe you, like most Liberals, want to pass laws that might make us safer, and when they fail, blame the constraints of the system or the lack of funding due to mean Conservatives?
The truth is, they could have had an agent IN THE STORE NEXT TO THE SHOOTER AS HE PAID FOR THE RIFLE, another as he took it to the range to test it, and three more scouring his application for any reason to deny the purchase. None of it would have mattered, because he did not require that gun from that store to have his plan succeed, If that purchase was denied, he could have found a private seller or had his wife apply as a straw purchaser. he could have paid a premium for a stolen black market rifle. Maybe he could have stolen one from an unlocked police cruiser?
The point is, you can have as much government as you want to say it makes us safer. it doesn't. To pretend it does ignores the real problem and avoids effective solutions.