The perfect is the enemy of the good.
No matter what endeavour we take on to make the world a little better, there will always be critics. The critic might be an internal voice, or it might be a well-intentioned 3rd party.
You will say "I'm going to try to eat less meat, let's try meatless Mondays".
The critic will say "You're a hypocrite if you don't go vegan".
You will say "I'm going to donate to cause XYZ".
The critic will say "Cause XYZ has flaws. Give your money to cause ABC, and give ten times as much".
You will say "I'm going to buy an electric car".
The critic will say "Ride a bike".
There is always someone - either external or internal - ready to criticize your steps. We need more people taking more small steps. It turns out, taking a small step, leads to another, leads to another, leads to running. But the critics will take away your oxygen just as you start walking.
Ignore the righteous. Take the step.