Absolutely true. However, making better personal choices does make these systemic problems easier to solve. When people know vegetarians, meatless meals become more comprehensible. When less people use piped natural gas there’s less justification to keep this utility around and reduces the scramble to buy electric appliances if it does shut down. Taking public transit where available funds further public transit, justifies its existence, incentivises more transit centered development, and lets similar places see that that service is in demand.

Capitalism and democracy respond to perceived demand. Not what you want, but what they believe that the masses are willing to act on.