- The shooters were not in The Trenchcoat Mafia (TCM). TCM was a thing that some of their classmates used to refer to themselves. Dylan and Eric were never closely associated with it. The coats they wore during the shooting weren't even trenchcoats, they were dusters.
- They weren't outcasts, and the shooting was revenge against the popular kids. They weren't the most popular kids in school either but that had fairly normal social lives, went to parties on the weekend. If I recall correctly prom had been a few weeks before the shooting and both had gone, with dates.
- The infamous exchange in which they asked a classmate if she believed in god and then shot her when she responded "yes" never happened.
This source seems pretty good: https://www.policeone.com/school-violence/articles/1228405-T...
I first found out about it from this podcast: http://www.socialmatter.net/2017/05/12/myth-20th-century-epi...
[0]: https://www.cbsnews.com/news/family-columbine-student-killed...
The narrative right after the shooting was that 2 loner goth kids did a horrible thing to get revenge on their bullies.
However they had a circle of friends, and were more focused on becoming infamous than killing anyone in particular. It wasn't an impulsive attack; they planned for a very long time and wanted to outdo Timothy McVeigh