Yes we all have a right to keep and bear arms.
But I believe Magnum Wheel Man has a good point. The instructors are letting these people (and the rest of society) down by not encouraging safer, more effective handling of firearms. There's a difference between exercising an inherent right and practicing at it (or not practicing and knowing your boundaries) and carrying without any classes because the constitution says we all can. After all, every one of us here teaches safety first and if the reporting is anything like what is happening at the range, it doesn't seem to be a very safe environment.