Their individual contributions don't matter, but they definitely matter. They represent a substantial portion of the population who simply do not care about the environment and believe in its active destruction in their own neighborhoods and cities. This is important to recognize.

They're the tip of the iceberg, as it were, the visible portion of a largely invisible but sizeable community who establish (through direct action, voting, and how they spend their money) a pattern of willful environmental destruction. And this is even without considering climate change. These are the people who think it's fine to toss garbage on the street, which has a much clearer and short-delay impact. If they don't care about that, good luck getting them to think on anything with long-delay impacts.