These mobs aren’t evil masterminds. They are over trivial matters.
However, based on the title you provided (which translates roughly to "Today, an Unconscious Mob Destroys the Main Story" or "The Unconscious Mob Who Destroys the Main Story" ), this may be a lesser-known or niche web manga/published work. There’s currently no widely known mainstream manga with that exact title. These mobs aren’t evil masterminds
It exists as both a light novel and a manga adaptation . Author: Satou Ryousuke. Publisher: Futabasha. These mobs aren’t evil masterminds