In Christianity in general, a common view of Adam's transgression has been that it was something bad that resulted not just in a loss of something good.
Among the consequences of Adam's transgression is also the current state of affairs among mankind with death, diseases, war and so on. Out of this short list of consequences warfare is the one that has changed most toward worse during the last two centuries.
Mormons however believe that Adam's sin was a necessary step forward.
For example the answer to this other question says that
Life is an opportunity to learn to choose good over evil. This could not happen if there was not good or evil. (See 2 Nephi 2.)
The sacrifice of the Son of God was planned from "the foundation of the world" (Revelation 13:8). So also was the Fall -- which necessitated the sacrifice -- known from the beginning. Mormons often describe the Fall as a fall downward, but also forward.
In this question I am just focusing on the negative developments after Adam's transgression.
Presumably things like the Holocaust would never had happened if the transgression would not have happened.
However Mormons view the transgression as a necessary part of God's plan without which humankind would not have been able to learn what they needed to learn.
Because of this do they also consider the subsequent events as somehow necessary on the larger scale of things?