there have not been too many fatal night crashes
That may be because, taking PPL GA as a whole, VERY few people do real night flight.
By that I mean flying at 2am under a thick overcast when it is pitch black, few if any street lights down below, and zero prospect of navigating the good ole fashioned methods PPLs are taught. It's 100% instrument flight, IFR navigation. People that do that are going to be instrument pilots, flying decent planes, and not many of those crash due to CFITs or engine failures.