You’re really missing the point. Nobody would say “the ‘goal’ per se is decreasing attendance to events like this”.
They did exactly what they set out to do. Make a public spectacle that people write news stories on and then the public talks about it. Normalizing discourses of these issues and drawing more attention and support to addressing them.
People who are already of the corporate lapdog mindset that any inconvenience to them about social, political, and environmental issues should just go away won’t have their minds changed. But nobody wants to change their minds, they understand these people won’t change.
But young people especially will be drawn to support causes and invoke change when they are constantly reminded that their future is being destroyed around them, instead of just buying into distractions and ignoring it all.