i dont care what type of gun you have the same amount of human error is in play. some times the safety itself becomes the reason you end up with an accident... a safety is no excuse to be less comfortable with your pistol.
How can a thumb safety on an every day carry pistol cause an accident?
I carry a 1911 every day, cocked and locked. I train with it, and it's second nature (muscle memory) to swipe the safety off as part of my draw stroke. When I switch to pistols without a thumb safety, my thumb still makes the motion regardless. I won't use a pistol that you have to manipulate the safety differently (IE slide mounted safeties that up is hot and down is not, opposite of a 1911 style safety).
I've never had an accidental discharge, and I have yet to have a negligent discharge... The safety has nothing to do with that, it's got to do with me ALWAYS following the 4 rules:
#1 All guns are always loaded. #2 Don't let the muzzle cover anything you don't want to kill or destroy. #3 KEEP YOUR FINGER OFF THE TRIGGER UNTIL READY TO SHOOT. and
#4 Be sure of your target AND what is beyond it.If you follow the rules all the time, you won't have a problem using a gun with or without a safety. If you do NOT follow the rules, bad things happen.
Implying that the presence of a safety is dangerous is silly. Don't blame the gun or its parts, blame the idiot screwing up and not following the rules of proper firearms handling and safety.