Good and evil are subjective depending on the perspectives of people both directly and indirectly involved. This whole topic is grounded on duality. Which we would not even be able to comprehend without. I.e. without bad things happening, we wouldn't know what "good" would even be... and therefore wouldn't appreciate life in general.

If there is a God, all he did was create a universe with beings that follow a strict and scalable law of physics. Survival of the fittest is a mental/conscious law just as real as gravity. Being kind to others, in the context of a human, is still selfish behavior at it's root.. we do it to be part of a group and be accepted. Selfishness isn't inherently bad, we're just creatures that have needs that must be filled first. Simultaneously trying to please our subconcious, unconcious, and egos

Bad things happen because people are greedy, selfish, pieces of shit that need to learn how to appreciate the lives of people with opposing lifestyle or opinions and learn that their biggest enemy is their own shadow