A polytheist doesn’t have to ask why an omnipotent good God allows evil. He can always just chalk it up to Loki or Kali.
Similarly, a satanist isn’t going to be too troubled when an internet atheist demands to know why satan allows bad things to happen. It’s the dude’s *job*, man.
The problem of evil does not become an issue when you posit the existence of an unseen supernatural realm transcending what is knowable to the senses and beyond the realm of time, space, matter, and energy measurable by the sciences.
Just so you know. That’s but one reason that polytheism had a prima facie appeal to ancient pagans and why, as Christian culture fades and we return to knee jerk assessments of the universe based on first glances and “It seems to me…” philosophising around the water cooler, there’s no particular reason that polytheism shouldn’t reassert itself again. When a culture stops believing in God it doesn’t believe in nothing. It believes in anything. A culture that is pagan in habits will eventually become pagan in intellect and fall for all the old lies and errors again, polytheism among them.