I like thumb safeties (if it is available, that's the model I want), but they do not change the fact that the four rules of firearm safety and general safe firearm handling practices (including safe holstering and use of a proper holster) must be observed at all times. I would rather have a modern firearm with multiple passive drop safeties that has no thumb safety rather than the opposite. As always, it is your responsibility to be safe and your experience may vary.
I am a bit surprised they don't have a manual safety version though.