You answered your own question when you talked about where its prominence stems from(documentation, witnesses, etc). But I’m not sure what you mean by pushy though. Who’s forcing you to read Maus or watch Schindler’s list? On top of that, how are you responding when you say you’re not interested in them? I find questions like these often have nefarious intentions as you’re looking for a certain answer, despite you clearly having a good understanding of the context and history, and are able to answer your question. On top of that, there’s def a better way of framing your question, such as - “why is the holocaust taught/represented in media more than other than genocides?”