Was the Parkland School Shooting a False Flag?

So there was a drill at the school the day of the shooting? And were the drill circumstances then used to purposely convince gullible young students that a real shooting then occurred? Why do so many of these alleged school shootings seem to occur at the same time that drills are orchestrated by law enforcement, either in the vicinity or right at the shooting location itself? We are convinced that the rash of recent school shootings are only a psy-op being carried out to pare down the resolve of Americans to defend their basic rights.