We examined Evil-: what is it and why does it exist?  Our starting point was Stanford Encyclopaedia of Philosophy on The Concept of Evil here. and The Problem of Evil here.  The question on the concept of Evil is whether it just means “very bad”, or is it something different and beyond. One approach is too try and define what we mean when we say “that’s good” or “that’s bad” and compare or measure them in some way.  We could consider the act, the cost to the agent in actual harm or to reputation and, importantly, their mindset (self centred or altruistic).  This last is crucial to the question, because it may be suggested that what tips a very bad act into evil is the active malevolence or wilful blindness to the obvious and severe harm done.  Some of us thought that was a sufficient condition, but it was not unanimous.  We also differed on whether (inexplicable) natural disasters can be said to be Evil, or whether Evil is a human ethical entity.
The Problem of Evil is that if there is a God who is Benevolent, Omniscient and Omnipotent, they would not permit Evil in the world: there is Evil, so that God cannot exist.  This is an Epicurean argument. and looks valid.  There are (at least) two approaches to refuting it.  One is to argue that God moves in mysterious ways, that there needs to be Evil to stand against Good, that we have free will, etc.  Another is to admit the argument and propose a God not Benevolent and Omniscient and Omnipotent.  It was argued that we could still have a meaningful God who is not Omnipotent: not that it is up to us how we act, but that God will know the best course of action we could arrive at and execute in any situation.