[hutzlibu]

"No, controlling a complex system is done by understanding its baseline or attractors and tweaking its inputs carefully to bring it and maintaining it there."

Idealism is trying to do this, targeting the human motivation attractors.

Doing (subjectivly) good things gives a good feeling.

And if it would not work, there would not be so many vegans for example.

Intrinsic motivation is a strong attractor, you can reach with idealism. But we agree, that in this case on a global scale - it will never be enough. But each person convinced that things must be done, is (ideally) one more person working on the problem.