A better way to propose your question is: out of all the millions of people on Earth who hear about these activities, will literally 0 of them take any meaningful action against climate change?
The likelihood of that quite small, suggesting a non-zero value. That non-zero value is likely to be smaller than the damages of water-washable paint.
I’m not advocating for anyone here, but I think that’s the calculus OP was suggesting, and it makes perfect sense to me.
If eye-rolling and annoyance produced greenhouse gases, then it might be a different story.