As Rob Kall has said, it doesn't take a majority to cause change to happen. Each small action that anyone takes towards that change matters. Any of those small actions could inspire others to do something they might not otherwise have done, and perhaps trigger a cascade of individual actions that add up to that massive change. That one snowflake or footstep that triggered the avalanche was no different from any other, and yet the effect was huge. You cannot know that your action will not matter.