This giant model stopped a terrible plan

I don't think we can change the fact that people generally listen to what actors (and other charismatic people) have to say. This is nothing new. For a local example, San Francisco's John Reber, and the plan he pushed to turn the Bay into a freshwater lake ( [this video] is a good video to watch). For a state (California) example, there's Arnold Schwarzenegger. For a national (US-level) example, there's Ronald Reagan. For what it's worth, Harrison Ford seems to be a stand-up guy. For example, his reaction when he accidentally landed his private plane on an airport taxiway: [link] So, rather than saying "Stop listening to <insert charismatic group here>", it's better to engage with and educate them.