MLK advanced civil rights by being a nuisance. Gandhi pushed Britain out of India by being a nuisance. I’m sure there are others.

It is in the nature of protest to be disruptive. It has to be. If it isn’t, it gets ignored. Climate change is getting ignored. What would you rather they do, go deface an oil refinery? That’ll just get them arrested and the news suppressed. Big public displays that can’t be hushed are the only way to make sure your message reaches the world. These folks have been considerate enough to make sure that message didn’t permanently damage its canvas. I don’t know what more you could ask from them.