how is adventure time a kids show when it is after the mushroom war?

What do you mean a kids show? I mean there are a bunch of cartoons that involve some sort of war and doesn't make them any less of a kid's show. Sorry, I'm not sure what you exactly meant by that question. However, just to let you know, nothing in reality is define as a kid's show or an adult's show. Everything is decided by the majority of the population. If the majority says it is a kid's show, then it's a kid's show. If the majority says it's an adult's show, then it's an adult's show. In real reality, nothing matters my friend when coming to whats right or wrong. It's what you decide it to be. I had a 44 year old teacher who loved cartoons and she could care less, and she was still cool. So about adventure time in society's standards, I think it's an adult's show disguised in a kid's show. In other words it's a show for everyone of all ages. Hope I answer your question. If you want, you can add additional detail to your question, so I can better answer your question. :)