Consider global warming as an example. Almost no one I know who believes global warming to be a dire threat changes anything about their lifestyle in response. When I ask them about this they might say something about how it's really hard, people like Elon Musk will solve it, etc. Basically, it's not their responsibility. They often seem to want to get off this line of conversation as quickly as possible. And it's not that hard to do something. Eating less meat is easy. I commute by bike for other reasons already and I don't think doing this regularly would be a major problem for a large fraction of people in the US.

To continue on the global warming example, you will have people who will drive a hybrid or electric car today "for the environment", though these options are not carbon neutral at the moment (perhaps electric will be in the future). No major change to their lifestyle has been made. I can see how this is mostly about signaling, as many people do believe such things will make a difference right now, though I'm skeptical.