The compassion and empathy you're displaying for your fellow human beings here is truly breathtaking and not at all out of touch with the world we live in.
Don't let anyone tell you otherwise.
By stupid, you mean they weren't quite aware of all the additional costs they'd encounter?
Sure.
There are a ton of people that don't spend obsessive amounts of time on a fan site that reports every single price increase and every single change to everything across property on a daily basis.
There are a ton of people that aren't well traveled and a trip to WDW is or at least used to be targeted at folks like that because it was one-stop and once you paid for the travel, room, and tickets, your biggest expenses were covered.
Heck, half the original premise of Epcot was giving people an experience they wouldn't otherwise get seeing other parts of the world in real-life.
Look up what percentage of US citizens don't have a current passport.
Food and beverages have always been higher than "normal" but in the last several years, they've really decoupled from regular inflation* and in the case of quick-service, the quality is also considerably less than the stuff many are used to finding at home at those much cheaper prices.
And remember, Disney
used to be the place to go where you didn't have to know everything before arrival. People that only went once when they were little and are taking their own kids 20-30 years later or who have never been before, don't automatically know you should devote weeks or months for planning the on-property aspects of this kind of trip.
After all, if someone wanted to do that, they'd probably go somewhere other than a theme park, right?
People budget for things, sure. If tickets and hotel are taken care of, I imagine that many think the main costs are out of the way until they show up and see the price of food in park and then what a hassle it is to leave to find something more reasonable so they pay it - not nesassarially something they're going to need to start selling their grandma's fillings to cover but more than they'd initially budgeted for.
Then they see the up-charges for things they didn't think they needed but now they find themselves having paid thousands of dollars for this family trip their kid has been dreaming about for a year or more so yeah, they're going to buy into some of these things they either didn't know about or didn't feel like they'd need when trying to figure out how they could afford this experience Disney has sold as a "cultural right of passage" for their children like it was for them at that age.
They're, doing what they can as people who aren't seasoned Disney commandos to have a good family trip.
You really have trouble picturing this scenario?
With an AP, I witnessed it fairly regularly with conversations around me for food or just while waiting for a ride and that was before things got the way they are now.
If any of that shocks you, it may blow your mind to find out people even still show up, look at the screens to figure out what they're getting and buy tickets right there at the gates after asking the cast member questions about the options through the little hole in the plexiglass window.
If that's your idea of polite, I feel sorry for anyone who has to deal with you in real life.
*not saying Disney is alone, here. At my local hockey arena, a $2 bottle of coke is $8 but for a game a couple of hours long, someone can go without drinking anything if the sticker shock is so bad - you're not quite as captive.