The speed limit isn’t a suggested speed, it’s an absolute maximum (excluding motorways with a minimum of 60km/h). If the road is frozen over you can’t drive the speed limit either, the same applies when it’s slippery due to rain or leaves or when the lights are off.
You always need to be able to react to sudden movement, no matter if it’s a pedestrian crossing the street, a motorist leaving their own driveway or even a trash can rolling into the road. It should be in your own best interest to avoid accidents.
The entitled attitude you ascribe to the overtaking drivers but also display yourself is just going to cause problems for everyone. Trying to shave a few seconds off of your commute by speeding in dark areas isn’t going to get you home any faster, all you’re doing is increasing your own stress level and risking someone’s life.
A little bit of respect on the road would go a long way to improve everyone’s experience on the road.