That's because Disney made the ride, and they are responsible for its operation. It is not the same thing at all, and actually shows that DIsney goes above and beyond when it comes to safety.
The reason Disney is beloved world-wide is because the movie experience, the theme park experience, and the resort experience are all man-made and designed for us. Splash Mountain and Beach Movie Night are the exact same thing because Disney makes no distinction and it's guests make no distinction.