the reason for evil is the laws of physics exist, specifically the principle of locality, and time (entropy, which is physical time). due to our world having started from some generic low-entropy state (big bang, but it's enough to suppose that your own personal world, i.e. your mental world, started from nothing) and moving through time, and due to us having physical bodies, it's only natural that we would experience our own cognition, which features preferences, and also the non-fulfillment of some of those preferences. we basically witness a clockwork about which we have opinions, and we'll sometimes have negative opinions on how some parts of it work. childhood cancer, etc., while tragic, happens due to physical processes and is not "hand-made to fuck us over". you can believe me when i say that i am taking the side of my enemies here when i say that i agree, strictly in this matter, not in others, with irenaeus, who had this theodicy. we basically experience evil because we are human at all; only the gods (philosophically speaking, as plato would say it) do not experience evil, but we are not the gods. perhaps the gods are even our future selves, but to get to the future, you need to go through the present. which is shit. though the idea that this is an intellectual problem is due to imperfect human understanding. i am not dismissing complaining about evil as just "whining", as some people do, just saying that, purely intellectually, it can be explained. you can even posit that "god is all knowing, all powerful, and all-good" by adding in the time-dimension, i.e. "we haven't seen the all-good end result come to fruition yet". of course, christians are, as usual, their own worst enemies because they posit a not-all-good end result (also due to sinful human nature, i.e. the desire to see one's enemies suffer), i.e. hell.
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