Disneyland was doing it right. At WDW, if a disabled guest is on a ride when it goes down, CMs aren't allowed to move them. If they're severely disabled, the paramedics (Reedy Creek in WDW) are the only ones who can touch them, so the guest must wait until they arrive. (CMs call the paramedics immediately if they're needed for an evacuation.) If they've only got a slight disability, then members of their party must move them. CMs also aren't allowed to help disabled guests load or unload in and out of ride vehicles; they must do it themselves or have a party member help them. For instance, if a woman asked a CM to carry her paralyzed daughter into a ride vehicle, the CM would have to say no. Besides, CMs (other than characters) are generally not supposed to touch guests, disabled or not, and on a ride or not.
This guest might have been physically injured if a medically untrained operations CM helped him out.