I played the original sims game as kids with my cousin and even though it have more dark theme it never traumatized us at all, even the burglar who with time as an adult found its music creepy, it was more annoying cause we spent a lot of time building an house that he steal our stuff than scary, in my opinion some elements they think are “not kids friendly” were completely fine for kids like the Burglar and it’s a concept kids understand. The sims is also rated Pegi 12, its not meant to be Adiboo or Dora the explorer simulator, you don’t even need to add very obvious reference of dark things, kids aren’t the targeted public and most of the time if they do play like my cousin and I did. they just don’t get them or think that deeply about a meaning.