RNG kills can be prevented. If you go near the banshee without plugged ears and drinking a potion of deafness and wearing amulet against undead, then you are putting your life into the hands of the RNG.
Stone block traps are avoided by playing a dwarf who searches 50 times before moving every step.
RNG can be avoided- most of us are too lazy, including myself.
Like Angband people say- if you take too many chances that have a 1% chance of death, you will die before you win- a lot.