Of course, cartoons are also for adults, why wouldn't be? I enjoy watching it with my kids and if we pay attention to almost all cartoons and animations on theatres have jokes that only adults are able to understand. Besides that many of the newly released animations featured plots with a moral lesson, mystery and a great soundtrack, ingredients that usually adults love. There are a lot of children's movies that are in fact, family movies, an excellent opportunity to spend quality time with our children, to get into their world and discuss what we watched with them.
The question is to vague to come up with an answer? what kind "bad" are we talking about here?