Triggers have been known to be snagged by a twig or branch of a bush in the woods, clothing going into a holster.... I had it happen once. I have carried both types and I found years ago when I carried a colt 1911 that disengaging the saftey as I drew did not alter my response or time on target.
I am now that guy who shot himself!
I should have listened to my initial instincts on the versacarry for my S&W SD9VE. Trigger guard on one side only? Plug in the barrel? I used it maybe 20 times before it occurred I think the waistband of my underwear snagged the trigger. Wounds still healing...