I can never ever understand the sentiment of - 'If I do/do-not-do XYZ, it won't make a difference since millions of people are still not-doing/doing XYZ in the world'.

It gives same energy as "If I avoid murder, it won't make a difference since murders still happen in the world. If I avoid meat to help climate change, it won't make a difference since millions still eat meat".

The goal is not to get the WORLD to stop. It is to get ME to stop. I will reap its benefits regardless of what happens to others.