You’ve shifted from “destroyed” to “damaged”, I notice. The varnish of The Hay Wain was damaged, but the painting was not. The frames of various other paintings were damaged. The glass of The Rokeby Venus was damaged. Nothing compared to what Mary Richardson did in 1914.
It is literally Just Stop Oil’s point that people will start wringing their handkerchiefs at these actions but they are doing nothing about the climate emergency which threatens all our lives. You think it will make a difference if these people vote for different parties? The current parties are already doing worse than nothing - Sunak is opening up new oil and gas fields.
It is not climate protesters’ responsibility to persuade people to save the planet that we all live on. It is up to everybody, and too many people are not doing their share. Just Stop Oil have a right to be angry. We should all be angry.