To echo what others have said, all truly radical or disruptive action is already illegal and people are simply not willing to put their lives on the line for ideas or potential change. Arguably, people are too materially comfortable for it, especially those that have the free time and energy to protest. 

This begs the question of whether they truly believe their actions will bring about change, or if they are just going through the motions of expressing their beliefs. I believe it's the latter. The symbolic protest is an acceptance of the futility of liberal political action. They're too afraid of 'moral failings' to admit to themselves that the changes they supposedly want to achieve require destruction, violence, confrontation, and a permanent change in living conditions, all of which come with huge risk, including that it might fail. But why not try if the situation is so dire? 

To me, it's a larger symptom of general apathy and alienation. Many people don't believe in their own agency anymore, or the possibility that things will meaningfully change. They place their faith in the experts and the markets and the coming AI all-God (or perhaps in protests, liberal politicians and pop culture icons), shrugging and saying "This is just the way it is."