In 1930s mysteries, all sorts of motives were credible which aren't credible today, especially motives of preventing guilty sexual secrets from coming out. Nowadays, people sell their guilty sexual secrets.
“An optimist may see a light where there is none, but why must the pessimist always run to blow it out?”
“Surgery is a complicated thing to talk about, but I guess it could also be a dangerous thing to play with if you're not very secure about what you're doing.”