What do you propose as a solution then, because a blanket ban on all mobility scooters doesn't work? Some sort of license test to show you know how to operate one? Forcing people to disclose the details of the medical condition that requires them to use a mobility scooter?
Y'know, I used to feel the same way about ADA-pass users "cutting the line" by going up exits to coasters - "That's so unfair," "It doesn't look like they have anything wrong with them," etc. Then I realized that not every disability is visible, and if I'm inconvenienced by a slightly longer wait time, it's worth it if everyone else is able to enjoy these same things. Far too often people only think of their own situations and how things affect them - If everyone would accept a little inconvenience in their life for the benefit of others, society would be a better place.
In all of my park travels since getting serious about this hobby (dozens of park trips per year for the past ~10 years), I don't think I've "almost been bumped into" by someone in a mobility scooter more than once or twice. And you know what, if I get bumped into, big deal! The odds of you being seriously, or even minor-ly, injured by someone else operating a mobility scooter are minuscule. I can live with that inconvenience if it means more people get to experience parks.
Note that I mostly agree that large/strollers and pulled wagons have no place in parks, but I think a complete ban on those hurts more people than it helps, and I would never be in favor of a park enacting a ban on them.
You're not looking very hard, I don't think, because plenty of my comments here are without snide remarks. As for "moral superiority," I'll direct you to Karl Popper's "Paradox of Tolerance," which states that a tolerant society need not accept intolerant views within it - it works for empathy too. My empathy for those who are differently-abled does not preclude me from calling out views which espouse that certain portions of the population shouldn't be able to enjoy things that "everyone else" does.
Edit: spelling.