No, I was making a specific point that Serpas may have an affordance that leads to an ND. It is argued by some that this problem may be solved by practice with where to put your finger.That's a debate from the human factors literature. Practice doesn't solve everything but some gun folks suggest that.
It does go against other literature.
Thus, OC in general has risks - an untrained person with a Serpa adds to that.
If you want my opinion that folks who carry should be trained - of course. Should it be the law - that's another thread.