I took CH to mean that he recognizes the likelihood of ever having to draw in self defense is -- statistically speaking -- quite low, not that he expects he wouldn't draw even if he needed to.If you're sure you never going to use it, then why carry it all? That's the safest option.
Unless the revolver is the type where the firing pin doesn't contact the primer directly, there is still a chance of the gun going off if dropped.
And I believe virtually every modern revolver (mid-20th century on up) prevents the firing pin from touching the primer except when fired; certainly that's the case for S&Ws.