What is a common way for a author to introduce an important idea or central concept

This is called a "topic sentence." It's common for paragraphs to have the main idea be the first sentence, because this allows the author to set up the rest of the paragraph and explain things immediately after the topic sentence.

Personally, i think the games do because it's actually them controlling it. this might cause them to think it's okay to do it for real. as for animated movies i think they are mostly fine because they're animated. also, animation has come a long way causing animated movies to become more real but 30 years ago this wouldn't be as big of a problem as today.