The easiest way to kill a movement? Convince people that if they can't do everything, they shouldn't do anything.
https://www.joanwestenberg.com/on-ideological-purity/
https://www.joanwestenberg.com/on-ideological-purity/
One interesting aspect of this is that the right demand purity from the left too. They're quick to reach for the charge of hypocrisy if you argue for better public transport but use a car - but if you give up the car they will charge you with 'virtue signalling' (even while they argue against public services while continuing to use the public roads).
The fact is we all have to live in the real world, even if we are working towards a better one.