How can controlled and predictable methods of reality bending cause more instability than spontaneous alterations?

[Erebus]

What we call "reality" is a subjective concept that varies from universe to universe. Hume level is a unit of measurement that determines the strength and/or amount of reality in a given area, having the unit symbol Hm. The standard level for our mortal realm lies at a rate of 100 Hm, although this level fluctuates higher and lower from time to time. These fluctuations are natural and are the source of all anomalies that occur in the world, such as supernatural events (haunted areas), otherworldly creatures (wendigos) and magical items. A Hume level to the extreme of either side is inhospitable to human life. A level that is too low would be chaotic and unstable, while a level that is too high would be completely static, and devoid of existence. A reality bender is a human being that can alter the Hume level of an item or an area, allowing them to control or manipulate its basic properties. These benders have an invisible aura with a Hume level slightly lower than their surroundings. Through intense focus and control, an individual use their own energy to "bend" reality of said spot in order to shape it to their will.

While the fluctuations of Hume levels are normal and happen throughout the world, such things are spontaneous and their affects are localized. However, reality bending has far reaching consequences that can be unpredictable. An individual who manipulates Hume levels artificially can cause ripples across reality that spread and affect a larger space, similar to dropping a boulder into a pond can send ripples across the surface. This can cause unpredictable changes, sometimes reaching thousands of miles from where the ripples started. These affects can be random and potentially devastating, such as causing natural disasters or changing biodiversity's of habitats, changing laws of physics, etc. In some cases, these ripples can cause reality to completely collapse in a given area, allowing things from beyond to cross over that shouldn't.

Natural and random fluctuations of Hume levels are somehow safer than a more controlled and predictable method. How can this be the case?

 

[pmmg]

Because of the will involved.

Is this a theoretical question, or one relating to a story world?

 

[K.S. Crooks]

It's not that they're safer, it's that there's no goal ahead of them. When something happens naturally there is no predetermined goal. No concept of something being wanted or not, safe or not. When a mind thinks of a change they have a preferred goal, an acceptable level of success or loss. It's all a matter of perspective and nature isn't concerned with perspective.