We are obviously dying. What's the point of doing anything in between now and the last moment? What goal of people who think that doing anything will make any impact?

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Some people do that as a symbolic action. Some to keep own terms as much as they can. Some hope their actions will join others actions and will turn into a signal for decision makers. For others this action reduces the area of their exposure. Others believe in something and just follow their beliefs.

BTW following own set of beliefs is what you're (we all) doing here. You believe that surveillance is already happening and nothing can be done about it, that single action does not matter, that there are no other reasons for action other than direct visible impact, etc. Seems that you analyze others through own set of beliefs and it can not explain actions of others. This inability to explain others suggests that the whole model is flawed in some way. So what is the nature of your beliefs? Did you choose them or they were presented you without alternatives? What are alternatives then? Do these beliefs serve your interests or others?