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I am surprised by the viewpoint in this thread that poor grip or user error is a very likely cause for a semi-auto to double. User error is certainly a possible cause, but I have seen more guns double due to mechanical problems than user error. I would say that most, but not all, of the mechanical issues were due to poor gunsmithing.
Regardless of the cause, I consider unintended doubles to be a serious safety issue. There is no particular reason to think the second shot will hit the backstop, it could happen at a point of the recoil where the gun is pointed much too high.
Also, if a gun doubles due to a mechanical issue, there may be a possibility that it will go full auto. And if that happens, there is no knowing where the shots will go.
If a gun is doubling, it needs to be examined until a cause is determined. If the cause is a training issue, then it needs to be addressed promptly. In some ways, the trigger is the primary safety mechanism in a firearm, and if it is not working properly, then it needs to be addressed.
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