A lot of people overlook the fact that Alvin was the one who created the chapter 4 dark world, and likely left Gerson’s hammer in his study because he knew he’d be brought back to life.
If anyone in hometown were to believe that Susie’s letter was true, it’d be Alvin.
No one seems to be pointing out that Alvin will likely interpret Susie writing Gerson's letter as a cruel and massively insensitive joke and it might lead to everyone hating her more than she already is. How would she even explain that