Again, that’s baggage you’re bringing, the topic is “D&D doesn’t need evil,” not “D&D shouldn’t have evil.”
The biggest hit movies are the ones that revolve around the fight of good versus evil. I think one of the reasons D&D is as big as it is because for a lot of people it supports this idea of good versus evil.
The MCEU doesn't need to be about good versus evil, heroes versus villains. Then again, The Watchmen didn't exactly spawn a multi-billion dollar franchise. I don't think D&D would be as big without the core concept of good versus evil that can be easily ignored if you want.