In case you haven't seen it already, Organise Magazine has put out an excellent series of articles called "Let's Talk About..." criticizing various facets of Extinction Rebellion.

Cops and Security:
http://organisemagazine.org.uk/2019/04/24/lets-talk-about-cops-and-security/

Finance and Business:
http://organisemagazine.org.uk/2019/04/24/lets-talk-about-finance-and-business/

Race and Bigotry:
http://organisemagazine.org.uk/2019/04/24/lets-talk-about-race-and-bigotry

Solidarity, Autonomy and Decentralization:
http://organisemagazine.org.uk/2019/04/24/let's-talk-about-solidarity,-autonomy-and-decentralisation

Security:
http://organisemagazine.org.uk/2019/04/24/lets-talk-about-security/

Roger, Brand Management and Other Problems: http://organisemagazine.org.uk/2019/04/24/let's-talk-about-roger,-brand-managment-and-other-problems