Yeah and those ideas have a common thread to them - making other people's lives worse with no obvious gain to anyone. People should stop with that and spend some time thinking about how to make the situation better instead. Somehow modern society sprung up in place of barbarians living in caves and it wasn't by vigorous protest. The trick seems to be capital investment, clever application of science and accumulating reliable data. A lot of negotiation and tolerance of people who believe other ideas too. Violence did happen and in some small amount is probably useful but people go waaaay over the top in trying to use it as though it was a productive force. It nearly never works.

I was just reading about some environmental protestors outside the first minister's residence in Edinburgh. They're doing a Halloween protest with lots of pumpkins, it seems quite nice.

You're misunderstanding, probably intentionally. GP is not upset on behalf of the cold lunch or the person receiving it. They're saying this is a stupid way to protest. Until she was arrested (which was not an expected or anticipated consequence), it was utterly irrelevant and meaningless. It had no benefit to anyone, brought no attention to what she was upset about (which is moronic anwyays - being mad that robots are taking the "jobs" of DD/UE "workers" is completely misunderstanding the issue), and had no chance of changing anything. It was an idiotic way to "protest".

But go off about guillotines and cold lunches or whatever.

Sitting quietly at home? Like, not going into work, and possibly negatively affecting GDP?

The French students form of protest has already yielded concessions.