George Monbiot writes about planning to be arrested for protesting for Extinction Rebellion. (I read that he was indeed arrested.)

It is misguided, even unfair, to criticize Extinction Rebellion for being "too white" or "too male" or too whatever of that kind, because that is not their choice. A volunteer activity must to go with those that volunteer. When an activity needs to recruit as many people as possible, it would be self-defeating to reject some volunteers for the sake of demographic balance. Rather, the activity must seek, and welcome, every volunteer that is willing and able to work for the cause.

If you would like more blacks or more women to participate in Extinction Rebellion, by all means try to recruit them. But don't criticize the campaign for doing the most it can with the people who have volunteered.

Indeed, people from less privileged groups may have rational reasons to hold back. Maybe they have to work 50 hours a week to get by. Maybe they expect the judicial system to treat them with bias. Maybe they can't afford bail and fear being jailed for months if they are arrested, or being stuck for years in a Ferguson-like cycle of fines and jail.

Given that privilege exists, I'm glad that people with more privilege are taking advantage of it to take risks for the sake of saving the world from disaster.