Cartoons and children shows are a lot easier to understand they require less thought to understand them. Many adults look for something a bit more mentally or psychologically challenging. Add to that that there are some things that adults don't want children to see.
I am not sure that they do. I am an adult, and I have never seen a show that told me that it was bad to watch cartoons. I still watch them sometimes, even though adults are a lot busier than kids usually, and we have less time to watch. But cartoons are still fun, and many adults still watch them. In fact, some cartoon shows are made for adults.
they are too old and watch ADULT shows.
because adults are older now they might still watch cartoons from time to time
Because that's likely their form of entertainment
The difference is the maturity and experience that an adult has. Watching only cartoons as an adult can result in a lack of maturity and experience whereas an adult watching cartoons as part of his or her entertainment shows responsibility and more maturity
Some adults find normal tv shows boring and perhaps depressing (news etc.) They are trying to find a new source of entertainment and watch cartoons because they usually consist only happy and joy full things. In the other hand sometimes adults watch anime, which has shows that are meant to be watched by adults, so its normal.
because cartoons are not what an adult should watch unless he has kids. ___ On the contrary, many adults watch cartoons, and it is okay. That girl obviously doesn't like cartoons, but that doesn't mean no girls like them, or that they are any worse to watch than some of the "adult" shows that can be stupid too. There is no rule in adulthood that says you can't watch cartoons. I am an adult, and there are some cartoons that I enjoy watching.
of course not, it's not even odd, plenty of adults watch cartoons.
Yes, when an adult you can decide yourself what to watch.
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Many adults who have children watch cartoons with their children as a social activity (although it is not that active, as activities go). Some adults do retain a lifelong love of cartoons. There are far stranger interests than that.
because mainly kids wach cartoons and bacause kids watch cartoons adults are more likely to act like kids