One the great unanswered questions is why evil and suffering exists.
It is commonly assumed that the two words are related and sometimes, they are used synonymously.
However, evil is often the name we use to describe a cause and suffering is used to describe the consequence.
Hence, while not all evil results in suffering, and not all suffering a result of evil, their relationship may be stated as follows:
1. Evil which does not result in suffering (Wicked actions which misses causing suffering such as a failed attempt to murder)
2. Evil which results in suffering (Wicked actions by people which cause suffering such as murder. Animals are exempt because we do not expect them to be morally cognitive)
3. Suffering not caused by evil (Such as that caused by natural disasters)
4. Suffering caused by self-infliction (This may be simply the result of making poor judgments)
Are there any other categories that I have missed?
Check out comment #4 for my response to the issue of evildoers who escape punishment