Um, what? Almost always?
There are plenty of Disney rides out there, so if they almost always have an agenda, please name ten of them and state their message/agenda.
I'm not OP, but I can give you some.
1. Flight of Passage - Conservation
2. Living with the Land - Conservation
3. Spaceship Earth - Teach people the history of communication and it's importance to our world
4. Remy's Ratatoullie Adventure - Spark interest in French cuisine
5. Three Caballeros - Spark interest in Latino culture
6. Soarin' Across the World - Importance of exploration/Leaving your bubble
7. It's a Small World - Unity amongst people groups
8. Test Track - Spark interest in technology/stem fields
9. The Seas with Nemo and Friends - Conservation
10. Killimanjaro Safaris - Conservation and Wildlife Protection
I'm sure I could list more. A lot of rides aren't simply made for fun, even if they are fun. There's nothing wrong with having an agenda or message tied to a ride, most just get frustrated when said agenda goes against their personal views, to which I'd say then just don't ride the ride. There are plenty of views Disney corporate holds that I don't. If they made a ride promoting those views, I'd just not go on it.