Of course they are many failures because only the failed cases can come back and tell us it didn't work. Logic much?
@mmikkee1
I think you also need to understand that fear of failure will always be a problem regardless of how secure you feel with your method and no matter how good it is. Be it N or shotgun, we've heard of all kinds of cases where people survive both of those surefire methods so in any case, since you have fear of failure with Sn, that doesn't mean it'll go away with a method that is better like shotgun or Inert gas. That's part of the mental process that goes into this, there will be that fear factor no matter how much you try to mitigate it, that's just how SI works after all.