This is the second time I've seen you try and compare someone not going on a ride at WDW to "holding a door open for someone or giving up your seat on a bus for elderly, small child etc." So in the reverse does that mean that someone who chooses to ride Dumbo without a kid is as rude as someone who isn't willing to do any of those things?
I always hold a door open for someone or give up my seat on a bus for elderly people or parents with kids or kids who need to sleep on the way back to the hotel. I even have my children learning to think of others when it comes to these situations. But you can bet I'm going to enjoy riding each and ever single ride I want too at Disney

every single time. One thing has nothing to do with the other.
I think thats where a lot of the reactions are coming from to your posts. Just because someone wants to ride Dumbo without a child doesn't mean they are rude people. I believe the defensiveness that is being felt in the replies also comes from this idea. People who are going to WDW shouldn't need to explain or have a valid reason for anyone to ride rides. It doesn't matter if it's Dumbo or TOT. If someone has paid admission to enjoy a vacation in a place as magical as WDW they shouldn't need to worry about such things. Kids or no kids, Disney is for EVERYONE.
Halloween parties could be considered geared for children. They sell out in some cases. Does that mean we shouldn't buy tickets if we don't have kids just so there are more tickets for those families that have kids just in case they will sell out?
Examples like this can go on and on all day long. Bottom line is that if Walt wanted Dumbo to be for children only, then I would expect to see a sign on the ride explaining that only children and those with children were allowed to ride.
Fantasyland is just that, another wonderful land in the MAGIC KINGDOM.....I don't recall it ever being called KIDS land.
But thank you for the suggestion.
Just in case it was missed and such