I haven't been here long enough to verify whether that norm (that it doesn't require bravery to admit a mistake) really is in place, but assuming it is, I'm sure I'll enjoy my stay!

Indeed, if there's anything that could make or break your rationality in one shot, it's whether you're afraid to make mistakes. There's no influence more corrupting than being afraid to screw up, and there's nothing more liberating than being free of that fear.