Seems a bit odd to accuse Corbyn supporters of not doing anything useful when they were being undermined from all angles. Smeared as anti-semites, hit pieces on state media, constant bashing in tabloids; sneakily undermined by a faction of their own party, as here, and even undermined by state security services (
https://www.telegraph.co.uk/politics/2022/06/22/jeremy-corby...).
This wasn't because Corbyn's side didn't have policy positions or wasn't getting things done - it's because wealthy vested interests were fucking terrified of what he would do.
Blair is a full-on war criminal btw, so presenting the two as somehow equivalent is staggeringly dishonest.