At least nominally, saving throws represent the element of random chance. Random chance that can be skewed by bonuses and penalties and many other things, yes, but random chance nonetheless.
"Random chance" is the meat and drink of storytellers. But the overwhelming majority of stories that occur by actual random chance… are pretty boring, which is why the ones people tell you IRL usually start with "You're not going to believe what just happened!". (^_~)
Edit: Got caught in lag halfway between. Sympathies to the server, which seems to be struggling under the weight of our enthusiasm for the latest chapter.