The way I think of it is that if you are already concerned about the future due to climate change etc., then you are not the target audience for this sort of action.

The whole point I take from it is that it is an attempt to raise awareness through "if you're upset about this, there's no excuse for you not to be upset about that"

If you're already in the loop on climate change and what's ahead of us - yeah, all that's left for you in this act is to be upset about the act itself.

I wish it wasn't necessary do stuff like this, but I am not at all certain anymore that it isn't.

If warning government officials does nothing, and warning the public does nothing, and scientists urging for action does nothing, and presenting reports and articles does nothing, and hanging up banners and buying ads does nothing, and protesting in front of government buildings does nothing, and protesting in front of "big oil" HQs does nothing, and protesting in the streets does nothing, and children skipping schools to protest does nothing, and throughout all this, voting does nothing because there are still not enough people that care enough about these issues, and politicians still take steps to make things worse, what's left to do?

What's the next step?

I don't know anymore. I'm sure others feel the same way, which is why I'm not surprised desperate and hard to reason about acts like this end up happening.

Here's a midler analogy (sincerely) "I am mad the perp assaulted a woman, but the woman cried about it very loudly and that was annoying to me. I can be mad about two things at once." Being upset about a painting and putting it on the same scale of societal collapse is a great example of equivocation that cheapens the greater harm.