> removing individual snowflakes from a mountain won't an avalanche stop.

That is exactly the point of the analogy. One single snowflake doesn't prevent the avalanche and therefore one single snowflake is not to blame. However if enough snowflakes are removed the avalanche is stopped. Similarly no single person is going to fix climate change. The only way we see results is if enough people band together to make changes.

And historically the best way for people to band together to collectively do the same thing is via government action. Far more important to do activism and press the government to solve it than to inconvenience yourself and think "Well, I did my part, now everyone should do the same".