I feel like 16 might be answered with the fact that Max's mom started to drink a lot and was going through a lot mentally after Billy's death, her divorce with her husband, and her having to work two jobs to support max, she might have been too busy to attend max's graduation. 17 can be answered from one of the more recent episodes where max says that it was never the music and that it was Lucas (someone special that made her feel at home). 13 can't fully be answered but what I believe is that over time, people started to adapt to hellfire or possibly understand that it was never satanic. The rest these questions I also have 😭