Does it seem likely to you that out of 3^^^3 people chosen with no particular safeguards, not one of them will find a dust speck in the eye to be maddening? It could be the last straw in a string of misfortunes; it could set off some causal chain that will lead to other maddening events, etc.
3^^^3 is such a huge number, some must find it maddening, but the proportion will be a lot lower than the odds that 50 years of torture breaks you mentally.
Does it seem likely to you that out of 3^^^3 people chosen with no particular safeguards, not one of them will find a dust speck in the eye to be maddening? It could be the last straw in a string of misfortunes; it could set off some causal chain that will lead to other maddening events, etc.
3^^^3 is such a huge number, some must find it maddening, but the proportion will be a lot lower than the odds that 50 years of torture breaks you mentally.