I kinda understand why comic book creators like making their heroes go bad. I used to be an avid watcher of what was called the WWF back in the 90s. And fans were thrilled whenever "faces" (good guys) would turn into "heels" (bad guys). And vice versa. And the "anti-heroes" of the WWF were extremely popular too. If Marvel wants to make their heroes turn heel but then return them to being good guys, they can't go too far with the villainy. People like Pym, Wanda, and Stark are kind of stuck in that "evil" hero mode right now I think.